This here is assuming you don't have a nation state actively trying to track you down. Otherwise see [0]
One option is to use basically any provider + prepaid visa cards. Just access the website over tor or a VPN you semi trust. Sure it's technically traceable but not without a lot of trouble.
Keep in mind that once the VPS provider is issued a subpoena they still have access to your connecting computer's IP. They then have to issue a subpoena to your ISP for your account information. The only way to hide your IP is to use a proxy or a vpn... Oh wait, yeah that's the issue. See [0]
I personally just recommend using whatever you'd like, Vultr, DO, scaleway, etc. Feralhosting isn't anonymous but they uh... don't care what you really use it for cough torrents cough.
[0] If you're REALLY trying to be fully anonymous then you'll need to put on your blackhat. I would start with planting a raspberry pi in a business, library, coffeeshop, etc. You can use that IP as a starting point. You won't want to use only that one IP most likely, so you're going to need more proxies/servers, most common method is botnets. This really isn't worth the trouble to 99.9999% of people.
Edit: I guess I'm estimating there are ~7,000 people in the world who it's worth the trouble to do.... Actually that might be accurate, cool! :D