A comparison between the mentioned Ampere Altra Q80-30 and AWS Graviton2:
https://blog.cloudflare.com/arms-race-ampere-altra-takes-on-...
A similar instance to the RX220 at Equinix (bare metal) would cost around $1800/month [1]. (8x Hetzner's price)
[1] https://metal.equinix.com/product/servers/c3-large-arm64/