I thought unpopular opinion meant: „I feel a bit alone with my opinion on xyz, is there someone who shares this opinion?“ I think it shouldn’t mean: „Here is my completely unhinged take on xyz that would get me banished from my community if I ever said it out loud“.
So imho it’s expected to stumble unpon people that agree with you.
It should be for „ I think socks in sandals are cute.“ and not „Hitler was a great guy and did nothing wrong.“