What worked for me was handing them a credit card and transitioning myself out of the free tier. (I'd use the free credits they offer prior to doing this - they give you something like $300 immediately on signup.)
The always-free infra remains free, you just have the chance of incurring a bill if you make selections that aren't free or exceed block storage/egress (200GB/10TB) limits of the always-free tier. Leaving the free/trial tier gives you access to a much larger pool of instances. I never successfully deployed an A1 instance prior to becoming a "paying" customer - now I've done it hundreds of times without ever having an issue.
I've been running a small k0s cluster and a standalone webserver for months while incurring about $2.50 - $3 in spending each month, primarily from being slow to remove instance snapshots sitting in block storage.
Even things that are oddly expensive on AWS - like NAT - are free on Oracle. There are zero gotchas.
I hit the same roadblock as the above user and it never occurred to me to just cross the barrier with cash and then scale back to free. Thanks for this.
It doesn't actually charge you anything. You just have to put a card down to be considered a priority because now you potentially can spend money & therefore are more important then the other free-tier losers. /s It's still free tier & still free.
The free tier is also based on capcity usage, and not instances. If you want 3 cores on 1 machine & 1 on another, they're cool with that. I personally run Pangolin on a 1 core & self-hosted github runners on a 3 core.
