[rndgermandude]

Kinda but probably not really.

Grindr is mostly used for semi-anonymous "hookups" - I am told anecdotally by people who used it and by the media at large - which is something even out and proud people might not wish the world to know (e.g. because their spouse might disprove), especially not in harsh detail. A lot of the communication on grindr ought to be pretty explicit too given how it gets used, something you might not want to see made public either, even if you're out of the closet already.

Now the other theoretical site might be as "bad" or even more so as grindr (the fetish website you suggested), or it might be a "tame" website used mostly in a "tame" manner, which of course still has "potential" to a blackmailer, but less so than the grindrs, tinders, backpages, adultfriendfrinders, etc of this world.