A tiny VPS can be free, even a medium sized one. Oracle for example offers 4core aarch64, 24gb RAM, 200GB disk VMs for free.
Not sure what's the catch though, Hope someone else who have used it will enlighten us. If I have to take a guess, It would be network performance like most other inexpensive cloud infrastructure providers but the load balancer says 10mbps.
In general, I can highly recommend them.
Have you checked their security promises? AWS KMS like service would be bit too much to ask I guess, Considering they're VMs FDE should be fine?