I tried a linux vm to test some wordpress sites, and got an excellent performance. BUT after the trial ended everything was deleted, just a few hours after it ends, no alert about this, nothing, I found out because the site was gone!
In context, payment method was provided for any possible expense beyond the free tier. AWS and google have free tiers as well, and they just charge you as required.
I was just keeping the vm and preparing of bring my other servers from google, but no way. All I got from support is a "post this in the forums", nothing can be recovered. I suppose Oracle is made for big firms only.