I have just acquired an investment property flat in an area that could be very attractive to WGs. I know of at least 1 (highly reviewed) in an nearby building.
As an occasional punter it amuses me to think of it being used for such purposes and to imagine what terms i could add into the tenancy agreement about freebies

I am confident that in reality it would just be far more trouble than its worth and WGs generally would rely on cash payments which could get complicated.
So don't worry, i will not be (knowingly) doing it.
BUT it made me wonder whether other punters on here have had any experience / tales of letting property to Service Providers?