If we decide to stop submitting X/Twitter links, then we should do the same for NY Times, Wall Street Journal, Medium, Threads and a ton of others.
I don't like the idea of picking and choosing a flavor of the week to cancel. So let's cancel every single site that requires a sign-in or has set up a paywall ..or.. leave them all alone.
As solutions... I like what slashdot does with their comprehensive summaries. It is a thing of beauty. Not only does it help solve some of these issues, it has found a way to archive content. osnews.com is another site that's similar.
If you go back even just a few months on HN, you'll see that lots of the submitted links are dead, 404s. We still have the (opinionated) conversation but not the actual content.
I also like archive.ph as another solution that can be used to bypass many paywalled sites.
I think we need to look to solutions to these problems. Just look at the subscription model... and things are just going to get worse as far as accessing linked content.