Comment by kemayo
Looking at ShareOpenly, I think this is basically a reaction to "Mastodon instances make social sharing complicated from the web". A "share to Mastodon" button is impossible, and a button for every Mastodon instance in existence is impractical. Thus a "fuck it, I guess just put in a URL and we'll work out how to send something to it" solution.
Speaking as someone who never ever uses a share button I think this is misguided, we should just remove that entire class of widget from the web, and people who want to share things can copy-paste the URL into their platforms of choice.
I agree. Except we aren't there with web literacy and having that integrated UX is significant.