I use a different https://anonaddy.com alias for every one of my 1600 online accounts, and each alias is also uniquely plus addressed for good measure.
This isn’t because I’m a privacy advocate. I just want to be able to know where my mail comes from. This almost makes Gravatar useless for me, since without at least none of my accounts are associated with Gravatar,
Consequently, I should be able to specify something like in Discourse when choosing the Gravatar option
Yeah, it seems like the best solution is to just request this server-side at https://git.linux-kernel.at/oliver/ivatar/-/issues/new for the Discourse insteances that use Libravatar instead, although I’d still love this eventually somehow.