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Afaik they do but only for low system ressource usage. Anecdotally I had my test free instance culled years ago. But later I deployed a minecraft server (higher baseline ram+cpu use than a web server or small app) and they never culled it (3+ years uptime until a friend reminded me of the server and I updated/restarted it)

You have to upgrade your account to Pay As You Go. I read that and did it from the start. Never shut down. So many people run BOINC and all kinds of nonsense to keep the CPU busy when they don't have to.

I congratulate on even being able to get a free instance, i've never been able to verify my account and I try every 6 months or so!

I've had no issues but I'm a PAYG customer but stay within always free limits.