Every time someone says something like this, I can think of examples of every point just from the limited scope of my own life to the contrary, which from the frequency it happens I'm guessing indicates my experience isn't so unique and the world isn't this doom and gloom black and white world as described on the internet. People still meet serendipitously. People still go out. The golf club at my municipal course still throws out several tournaments a year with enough demand for like four each mens and womens handicap flights. Maybe the people alleging these things have to look inwardly and ask why they aren't themselves doing these things that can still be done today.

They did, but it turns out that people’s most common social activity/interest is sex-based.

Omegle wasn’t known for making BFFs.

There is one: universities. They're just really expensive so you can't stay there for more than a few years, and people aren't properly advised of how important the opportunity is.

Meetup is kind of like that. I use it for ongoing hiking clubs and book clubs and movie clubs.

Comically, Facebook sort of serves this way as well by brining together hiking clubs and d&d groups.