Musk’s latest decree banning the promotion of Mastodon on Twitter is an obvious attempt to stymie services like Movetodon/FediFinder.
Suggestion: These services should allow users to validate identity by posting an innocuous but 100% unique plain English phrase in their Twitter bio known only to the identifier service.
Alternatively, if the account is public, a public tweet could be used.
Musk can’t police that — certainly not through automated means.