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I still find people who do this
(slrpnk.net)
At my last job, a bunch of the older folks did not realize they had a "two spaces" habit.
It's a clear tell.
Saw this meme and thought I'd point that out.
Also a lot of people who put a space before punctuation, as in "really ?", which I've been told may be a tell that the writer is french or studied french.
(A lack of capitalization for country/demonym-ish nouns and adjectives may be a tell that the writer is norwegian—we just capitalize the proper country name, the rest comes off as random capitalization we'll often get wrong, with or without autocorrect.)