Telex

Your nice list doesn’t seem to have non polar solvents in case it’s greasy. Something like soap, alcohol, (turpentine, acetone, xylene).

But yeah, might not be a surface stain as the other comments suggest.

Sounds like Gnunet or sone other P2P system?

Well, I’ve never had problems finding it in Finland and still don’t. Generalising assumptions are going to be wrong.

Governments Are Suddenly Shutting Down The Internet

They are not. And can not, especially individually.

Dismissing problems using cheap labels like that helps even less. Actually causes harm.