Have people even actually spend any serious amount of any resource on it?

I only see people talking.

How do you even "fix" loneliness? If you don't know that, you can't allocate resources. Plenty of research studies have been done on loneliness to find a silver bullet.

For most people, it's not like there aren't opportunities to meet people and talk to people. It's well understood that no matter how many people you get exposed to for a period of time, meaningful relationships can't be forced.

Plenty of lonely people in big cities going to social events.