Snort utilized a question that needed to be answered before you could be dmed. Not sure if any other clients have implemented anything else for dm spam prevention.

you can use snort.social and in setting have set-up a question needed to be answered somewhat correctly before ppl can dm you

A good set of features may be:

- Option to ignore all DMs

- Option to allow DMs only from your follow

- Option to allow DMs from your list of paid relays (or relays your select)

Could clean up a lot of this.

10k sat dm paywall should fix that.