This is a problem that is big now, but I think can also be solved with maturing the technology in the future.
Right now I have multiple accounts for multiple bubbles, but I can easily imagine some app or website that can congregate the content coming from multiple instances and choosing the appropriate account for it to post/view with.
Thus allowing one to access bubbles that have shut each other off in one central place. Unless they do it by completely blocking sign ups in which case they isolate themselves willingly and that is also good in a way to have as an option.
If I can imagine all this as a random system engineer, surely some developers with a passion for this and open source collaboration etc. can too.
Oh wow thanks for searching it up I could have done that too, not sure if I trust Renzo on that attribution though, he was a wild guy who played fast and loose with quoting people just like I am doing lol.
Anyways, I don‘t blame you for falling for it and I did too and then clung onto it until the metaphorical frog was boiling. Reddit started with a genuine spirit of being "the frontpage of the internet" and managed to capture this spirit of community and collaboration so well since the original founders, at least those on the dev side like Aaron, genuinely meant what they set out to do.