Mate, ive figured out girls can make a hidden profile and still contact other men. No such thing as a exclusive one. From my time here, dont trust a seeking girl, lady etc.
FYI - It's easy for either gender to create a non public profile where you can still contact other members but they cannot see you in any search results. You go to the settings page, go to Search and Dashboard, and toggle it to Hidden. Hey presto, you can now be more or less invisible on Seeking. There are a number of other options to play with under "Your Activity" where you can prevent someone from seeing you have viewed them.
On your last point, I largely agree, it's wise not to trust girls from Seeking as the vast majority will actively deceive you.
However over the years I have found some girls who genuinely stop using Seeking when they have found someone where their financial needs are being met. So it is a possibility but like any dating app, curiosity often gets the better of them especially when the site emails them to say someone favourited them.. so they log back in. The other thing is maybe they deactivate their account on Seeking but most of them have active profiles on Tinder/Hinge/Bumble and active FWB situations. The same is true for Instagram which has pretty much always been an under the radar dating app.
As a rule, all of the girls say they are looking for one person or exclusivity because if they said "I'm looking for as many men as I can get and get paid" then we perhaps wouldn't look upon them favourabily. It's like what we as men say, "No, I'm not just looking for sex darling" 😂