Oh nice. There is an alternative to Let's Encrypt. The whole US shenanigans aside and assuming Let's Encrypt will continue to work: I think this is a good thing. More alternatives, more resilience.
It is ACME compatible and works with the usual clients, e.g. Dehydrated.
https://european-alternatives.eu/de/produkt/buypass-go-ssl
Disclaimer: I did not yet test it.