Having multiple accounts wouldn't help, as Microsoft could easily suspend all the accounts of everyone associated with the project if any account looks suspicious. The single point of failure is Microsoft.

You're not actually allowed to avoid this by having multiple accounts, that falls under "ban evasion".

But yes, there's a lot of critical single maintainer projects.

No, that is not the issue here. The source of the problem is something different. This is a wrong root cause analysis.

How would more than one account help in this scenario, exactly?