Could it be better to include the domain in an 'r' tag for example than in the content? This can be more queriable using filters

"What does this button do?" 👀

"This is useful for services and individuals who wish to associate their Nostr public key with a domain name for easy referencing, identification, or branding purposes."

nostr:nevent1qqswfsgr5fgmnfcny6jnnytamg44qfnzj5vd0vx7xatgj0lueqtdj6gpz3mhxue69uhhyetvv9ujumn0wd68ytnzvupzphn7e50zja4x4ke0lf05mwq60kqjezakdx92qrw0rem2md27l4j9qvzqqqqqqy6227hn

Is this the same as using an “_” for a username in the NIP5 mapping ?

https://dnstr.org/