Teese

Seems it's no longer free, but still going strong. Tech Radar reviews providers: https://www.techradar.com/news/the-best-usenet-providers

TwitterBannedIt

It's mostly warez and porn.

pitenius

Pitenius members. Forums are better than social media. Usenet is still there, but around 2000 the spam grew too thick. Of course, that is one kind of camouflage.