I've been on the free tier 1vCPU x86 / 1GB RAM for years and it was a perfect experience. I recently upgraded to the 4/24, and indeed you need to change to PAYG or otherwise it's out of capacity, but still no problem and within the free limits. For your use case, if the 1/1 instance is enough, I highly recommend Oracle and it's not something I imagined myself saying.
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