They exist. But they don't support Android apps that are unfortunately necessary. For example, any phone without WhatsApp or banking apps support is dead on arrival in Europe.
Which is why /e/ OS and Graphene OS adoption is higher than projects such as PostmarketOS (now Nura) or Ubuntu Touch, even if they are already quite mature. I daily drove Ubuntu Touch for two years in 2019 and 2020, and it's the need of Signal which made me switch to /e/.
The problem doesn't lie with e/OS/, nor any other alternative. Google locks down capabilities with "Play Integrity", effectively attestation for official Google approved operating systems only. If you aren't on the list you fail the checks, and apps (like banking apps) will fail to run.
But it’s banking apps that opt into that. It’s not like Google is saying you must use Play Integrity. It’s a feature that banking apps are more likely to use. The EU could require banks to make apps for other operating systems.
Based on my understanding of the situation, the 2LDs are getting sold, so yes, you should try to acquire the 2LD if you want to retain control of your subdomain(s).
More to the point it's that the server has to retrieve and massage data from several docker services to retrieve the full context needed to process the request
Alternatives exist. They just need signifiant adoption.