Then the community forks the OSS project and you lose control/struggle to maintain parity/mindshare. Gogs/Gitea, VIM/Neovim, Bitwarden/Vaultwarden...
The ones that succeed keep the community happy and either focus on adding value on top (open core, don't give away the special sauce) or deliver half assed products (package up the community leftovers and hope support contracts/services fill in the gaps).