Tinder disrupted the online dating scene by introducing the feature that you can only write someone after you've liked their profile, AND they've liked yours.
That makes a huge difference, and solves the spam problem.
I got back on Tinder about 6 months ago and bought a premium account after they kept waving the number of potential matches I had, only to discover that the vast majority of them (roughly 18 in 20) were 2,000+ miles away from me and looked like spam.
Photos with spammy gmail addresses and URLs written in them has been on the rise recently too.
Ban anyone who swipes right on it.
Or limit the amount of right swipes allowed per day.
It's been a while since I've used Tinder, but they were rate-limiting swipes - unless you paid up for premium features.