The CPU is not an issue, it’s the SSDs. Chia mining (or more precisely the creation of plots to farm Chia) is a write-heavy process that will literally wear out SSDs. See https://github.com/Chia-Network/chia-blockchain/wiki/SSD-End...

It might be worth noting that Hetzner is known to use consumer hardware for some of their lower tier offerings and consumer SSDs usually have a relatively low TBW (Terabyte written) rating.