It was partially used for serious dating (myself included) back when there were no other popular dating apps, meaning all kinds of people were on there. Since then, users have split out to other ones. Maybe Tinder wants them back.

Luckily I'm not going back cause I met my now-wife somewhere else.

I personally have not used Tinder, as I've been in a long-term relationship (that eventually turned into a marriage) since before it even existed.

But from what I've heard, I get the feeling that the majority of men think it's a hook-up app, whereas the majority of women think it's a dating app.

it was supposed to be a straight-people version of Grindr, but dating and sexual dynamics don't work that way for the heteros.

I would argue that it doesn't work that way for heterosexual women.

Men, both gay and straight, are far more willing, generally speaking, to be willing to have anonymous sex than heterosexual women.