[everforward]

They’re guaranteed to be permanently online as much as such a thing can be for $20/month or whatever. They don’t shut it down if you’re not using it, if that’s what you’re asking but they do occasionally come down for upgrades/migrations/incidents/etc. I’d ballpark most providers in the 99% uptime range.

Some provide root, some don’t. Last I checked, you’ll pay more for root because most of the servers are physical so you have to rent a whole server basically.

The servers are typically IO bound on the NIC so they aren’t super picky about what you do with CPU and memory. They won’t let you run a crypto miner or do heavily parallel transcoding, but if you want to chuck a Python+SQLite web app on there I doubt they’d care.