[image shows the following text "Log in to use old Reddit
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[image shows the following text "Log in to use old Reddit
To keep Reddit safe, accounts are required to access old Reddit. Log in, or continue without an account on reddit.com."]
Probably staggered, or something dumb like by subreddit.
Got it once day before yesterday, then next visit no prompt. Same browser, computer, different subreddit. Same subreddit yesterday and no prompt.