@tchambers@timbray@trwnh The Home Assistant project has https://my.home-assistant.io/faq/ to generate redirects to the web/app. It's centrally managed by the Home Assistant project, but it uses local storage to store your 'instance' address and then the home assistant app registers my.home-assistant.io to open. I realize this wouldn't work well with multiple instances and multiple apps, but maybe someone can use this idea to spark other ideas in addition to considering a registered protocol handler.
@dansup A naive part of me wishes the activitypub C2S got more love, but since I have zero activitypub apps, that’s just wishful thinking on my part XD