You're right, and I think it's a testament to how effective POSSE is. The dinosaur platforms are scared of it, which is why they are discouraging links.
You described the solution yourself. You can still do POSSE, but instead of a link you can write something like, "link to original post is in the comments" or "originally published on my website, you know how to find it".
It may be tricky or even impossible to automate, but isn't that how you know it's good, according to PG? :)
You are far more optimistic about this than me. The web has centralized rapidly and no platform is incentivized to allow links out.
Without legislation, these platforms can build walls easier than we can build ladders. Your average user isn’t all that interested in following links in the first place, so it’s an uphill battle from every angle.
Though it's hard for me to imagine legislation helping the situation, since regulations are usually written for/by the big incumbents to dig a deeper moat around themselves.
The scenario I imagine is that they already read the post on the other platform, so the reason they're going to the website is to find the latest and greatest, which appears on the other platforms with a delay, creating an incentive to go to the source.
Of course, this also requires content engaging enough to create that reaction...
You described the solution yourself. You can still do POSSE, but instead of a link you can write something like, "link to original post is in the comments" or "originally published on my website, you know how to find it".
It may be tricky or even impossible to automate, but isn't that how you know it's good, according to PG? :)