Question about GPL theft

[Geico Caveman]

Imagine the following scenario.

One of the BSDs copies some GPL'ed code and releases it under the BSD
license. True to form and history, Microsoft then copies that "BSD" code
into its own codebase and releases it under a proprietary license.

What happens legally now ? Isn't Microsoft the recipient of stolen goods
here and legally liable ?

If not, what stops Microsoft from starting a front company whose sole
purpose is to steal GPL'ed code and re-release it under BSD, making it
legally possible for Microsoft's substandard programmers to copy and paste
it ? Any legal action to follow then could firewall Microsoft from any
legal liability, and permit Microsoft to start as many such front companies
it wished to steal other kinds of non-BSDish open source code.

I am assuming that the direct theft of GPL'ed code would be detectable and
considered too risky legally.

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