Yes, I've noticed Twitter has started doing this in the last few days.

I'd like to thank the bean counters at Twitter, because I'm not going to sign in, so this new feature means I'm going to spend a lot less time on Twitter.

Any nitter instance can help with such things. Here's one:

https://nitter.nixnet.services/joelburgess/status/1428008043...

P.S. Nitter also puts RSS links at the top of everyone's timeline, which is handy if you would rather use an RSS reader than a Twitter app.

You have to open it in a new tab. I can't click to expand threads or follow anything on twitter (it appears to start loading, then gives me the 'Sign up' prompt). But I follow a link in a new tab, it works fine

I believe it is their new rule. But it shows up only if you are using twitter for a while as logged out. Clear data from browser and it goes away, but will eventually show up again.

If on desktop, just block all cookies from Twitter.

Happened to me too. Switch to desktop mode.