it's always that isn't it? They could go raid the guy's home perhaps. Alternatively you sent embarrassing messages to a woman on a dating app, you have a weird fetish you discussed with someone on there, you're cheating on your wife, or maybe some nation-state actor wants some blackmail on you. A hacker or disgruntled employee has dumped a database of all the messages and journalists and Twitter users are going through it right now. Or maybe you don't trust Bumble. They seem to have an axe to grind anyway.

Not that the issue of minors isn't a problem but I don't think that should always override people's privacy. And FWIW there is plenty of space for people to share compromising messages on the dating app before they can manage to convince a stranger to download Signal and continue the conversation there. That's if you're lucky enough that she doesn't immediately think you are a scammer of some kind.

I am on the side of privacy extremists but a lot of people find that to be a nonstarter so to each their own. I wouldn't dare go on a dating app that didn't have E2EE though or at least a way to anonymize yourself so no phone # required. ;)