Since Twitter is suppressing the visibility of tweets that link outside their site I think it would be perfectly fair to block links to twitter, rewrite them to nitter, etc. There also ought to be gentle pressure on people who post to Twitter to move to some other site. I mean, even I've got a Bluesky invite now.
Well I didn't mean to just endorse Bluesky but call it out as one of many alternatives.
I'm actually active on Mastodon but I am thinking about getting on Instagram as well because the content I post that does the best on Mastodon would fit in there.
but still, it's twitter, liable to vanish or block non-logged-in access at any moment