Main advantage is typically less DCMA take downs. The public ones are public access and therefore the bots crawl those and submit the takedowns faster than on a private indexer.

Just a cheap Usenet provider. They’re cheap for what the provide but in my opinion on par with the more expensive “premium” providers. https://frugalusenet.com/

DM me if you want invites to private indexers. They are paid but cheap. I also recommend frugal Usenet because…well…I’m cheap.

This has been my go to combined with a Usenet subscription.