For me it has been different, though similar. I am able to use many stream chats, that do not require verification streamerside. And then at some point suddenly the chat switches over the verified only. I was able to doublecheck with one such streamer where this occured on his next stream, when the chat reset had "reset" again for some reason to allow not verified accs, and the streamer confirmed that he had not made such a change to his chat settings at the time.
For me it has been different, though similar. I am able to use many stream chats, that do not require verification streamerside. And then at some point suddenly the chat switches over the verified only. I was able to doublecheck with one such streamer where this occured on his next stream, when the chat reset had "reset" again for some reason to allow not verified accs, and the streamer confirmed that he had not made such a change to his chat settings at the time.