I could be mistaken, but Oracle’s Always Free tier seems to me to be fool-proof in terms of accidentally incurring charges. You do have to provide a credit/debit card on signup, however they promise that it won’t be charged unless you change account type, off the Always Free tier.
As an example, so far it has been enough for me to run a Nextcloud server with around 180GB storage.
As an example, so far it has been enough for me to run a Nextcloud server with around 180GB storage.
https://www.oracle.com/cloud/free/#always-free