For example in the screenshot (twitch clip), if you want to share on reddit you click the reddit button, but what button are devs supposed to put to share in the fediverse? Do they pick an instance of their choice?! Is this a weakness of a federated platform or what?
If it were me, when you click the “share to Lemmy” button, I’ll just show a drop down list of most popular instances, followed with a “Custom…” item at the bottom where people can type their instance’s domain name.