Two accounts in the same alliance

While browsing forums, I came across a case where someone got banned for using two different accounts from two different devices, but connected to the same Wi-Fi, to be in the same alliance. This made me curious to ask, is there any issue with me being in the same alliance using two different accounts in the same household environment? My devices are different.
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I've had multiple alt accts over the years, same devices, sometimes different devices, usually in the same alliance, and never has an issue.
I've only seen one time personally where someone actually got banned in error, but that was also resolved and they got unbanned.