I'm asking because it seems to be happening. Also, I suspect "sockpuppetry" investigations are complex to conduct, so I'm not trying to rush anything, but I've raised some such flags about a week ago... Does progress on those depend e.g. on cooperation from the SE staff?
A bit of searching found a relevant page on the "big meta"
When should sockpuppets be considered a problem?
[...] if the second account allows you to do something on the site that your normal account would be prevented from doing, it is abuse. Examples of this include (but are not limited to): [...]
Circumventing suspensions, quality bans [...]