The EU comission is on such a wrong track with all this de-regulation and mass surveillance.

Sorry for not answering to your question directly, but why not just use subuids for separation instead?

podman run -d --restart unless-stopped \
  --uidmap "+0:@100001:1" \
  --name nginx-1 \
  --port 8081:80 \
  docker.io/library/nginx

podman run -d --restart unless-stopped \
  --uidmap "+0:@100002:1" \
  --name nginx-2 \
  --port 8082:80 \
  docker.io/library/nginx