At this closed question the user seems to be playing ignorant, but I looked at their network profile and some of the other StackExchange sites, and there is a prominent banner

This account is temporarily suspended network-wide. The suspension period ends on Oct 5 '21 at 21:22.

on all the ones I checked. How was this user able to ask a question on MathOverflow?

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    $\begingroup$ I know nothing about this specific user’s situation, but for one thing, a user with a network-wide suspension may be manually unsuspended on any particular site by a moderator, see meta.stackexchange.com/questions/257498/… . $\endgroup$ – Emil Jeřábek Oct 7 at 18:14
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    $\begingroup$ Actually, are you sure this was really this user’s network profile in the technical sense? The (now apparently deleted) MO user profile could have been a new user account unattached to the suspended network account (even if presumably created by the same person). $\endgroup$ – Emil Jeřábek Oct 7 at 18:24
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    $\begingroup$ Well, I only got to the network profile from clicking through from here, so I don't really know. I suspect this user has been here before, asking questions relating RH to the zeta function as a wave, and other really peculiar questions about vaguely race-related issues on other SE sites. $\endgroup$ – David Roberts Oct 7 at 21:25
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    $\begingroup$ Re: @DavidRoberts last comment- see the other Meta question meta.mathoverflow.net/questions/4664/… $\endgroup$ – Sam Hopkins Oct 7 at 22:20
  • $\begingroup$ @DavidRoberts Don't forget the claim that apparently all answers on MO are just people copying results of Google searches $\endgroup$ – Yemon Choi Oct 8 at 1:11
  • $\begingroup$ @YemonChoi I missed that one! $\endgroup$ – David Roberts Oct 8 at 3:09
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    $\begingroup$ @DavidRoberts All right, this should work, thank you. I couldn't test it myself as the MO profile had already been deleted, and I didn't know if you used this or another method (such as searching for the user name). $\endgroup$ – Emil Jeřábek Oct 8 at 7:02

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