I don’t get it. Of course they are using techniques to manipulate and hang onto users. But what’s the basis for litigation? You can’t sue a casino because you dumped a few grand into a slot machine. Plus, the dating apps don’t take your money every 5 seconds like a slot machine.
The real insidious harm is when people stay on their app while dating. Looking for someone better, perhaps. This leads to a failure to commit to the experience of who you are with, preventing a meaningful relationship from developing. I wonder how frequently that happens. Greater than 50% I would guess.