Hi sammathy
Indeed it is a difficult pill to swallow when an SP takes a shine to you, and then to report back here the extras she offers, all for one of the rare munters on here to decide to blackmail the girl instead of just finding someone else more accommodating. 
My hard and fast rule now is any specific SP who offers me UTC, free sex or exchanges socials with me, I won't even review full-stop, unless it's already publicly known information. A couple of girls who I ended up in flings with have bad reviews on here, but all my times with them were positive. Despite this, how beneficial would my potential reviews have been to the forum, if I've essentially become their Sergei and it be considered touting?
In my case the reporting of the service has backfired. I did think, when writing the review, that she specifically says she does not allow this service. She allowed the service for me. I don't why. It just felt a natural thing to do. She did not demur, I would had complied if she had. I should had taken my internal hint not to list perforning the sex act but I felt compelled to share information which is why I wanted to join this site. To give back to what it has given me.
I agree that anything UTC, free sex and socials is not to be reported. I believe socials are banned to be reported in any case on the forum. I have done that on my reviews to date. I just did not on this review and its blown up with the lady pointing it out on her profile.
I also taking your point of being alleged to be shilling.
A good point you make there. But I do think that there's a benefit in sharing winners. Helps other punters to add a reliable girl to their hotlists. Indirectly she'll appreciate the surge in business but not know quite what's causing it. 
I've reviewed girls who've I ended up struggling to book again, but don't regret it. I understand that despite her enthusiasm, she has drawn a professional line, so I leave it at that and move on to the next.
To go back to @Wayfarer's dilemma, in retrospect, it might not be harmful to review girls who give UTC but just omit said activities, and only draw a line at girls you have follow-up meets with off the books. Because my advice may be a hard one to stick to if you're just that guy with the ladies. 
Staying with an SP over the allocated time could fall into the UTC category after all.
I agree with this as well, to share winners so others may experience the same. Not to gate keep the good ones. I know there are reasons for gatekeeping like making sure she is available for you to book yourself and not booked up by others or fear as she becomes popular that her prices go up and you can afford less.
Your point about being open to drawing a line and move on is important. This is a hobby. She is not your friend or girlfriend. If it is hard to book her or it costs too much for what you are getting then move on to someone who will see you or charge within your budget. It is as you say a bitter pill to do this, but do it. I have been here a few times myself and seen the money poured down the drain. My friend tells me to charge the cost to punting. Do not punt more than you can afford.
I think I will continue review the ladies where I receive UTC or extras not provided to others, but as you advise and @pilotman says:
1) if the service is not on her likes list or is not listed at all then do not report. This is where UTC and unlisted extra services or services clearly banned.
2) if the service is discretionary then feel free to report the service to produce statistically useful information on how often the discretionary service is allowed
3) review freely services on the likes list. I will need to cross reference my review to the list of likes which will be a pain.
To be fair, I would not call extra time over the paid for allocated time a UTC. It happens. More likely than not my punts have been over time due to we are in the moment or we are having a chat and i am thinking I need to go as you have your next punter or I only paid you for 1 hour and she goes its fine, take your time, no rush, or chat. This can be anywhere from 10 minutes to hours over. But to date I have never mentioned it in reviews since its a minor detail to me as it happens. I definitely never mention when the girl asks me to help her take some videos or stills of her for her OF or TikTok or Insta. I end up directing her poses for arse and pussy angles. Just when she offers filming well I say. I would call that unlisted extra services.
