Not only OnlyFans profiles, but also Instagram. Some want to get to a few thousand followers and use it, I know even some people in relationships that did it.
And then there's the bots which just start a generic conversation and recommend some Clash of Clans clone or something.
But as mentioned, you realize that in the first 5 mins of interaction.
I don't know how prevalent this phenomenon is, but that's at least 0.9 on the Mad Max scale.
(As a demi/gay man, online dating is incredibly alien to me.)