I'm seeing the same behavior, wasn't like this yesterday. Also, yesterday I noticed they removed the search feature in the top-right corner for logged-out users. Previously I could search for a specific person, click their profile, and view their feed. Instead of search, there were "New to Twitter?" prompts to sign up or sign in, no search was visible.
I've never had a Twitter account and I really don't want one. But I do check the NWS (National Weather Service) local accounts for updates on severe weather, and now those accounts are behind an auth wall and I can't see anything at all. I wish they'd make an exception for public service accounts (NWS, fire, police, government) and make them visible to everyone.