It likely won't be done at scale, but let's say you are wildly successful and are now in line for a high-value position, where vetting is common. Might look pretty bad if you fabricated your whole thesis. Recently, Bill Ackman basically bullied several schools into firing their head administrators on the pretense of not citing sources correctly in their thesis papers.

It could be a new level added to the peer review of work. Nothing to do with the university. Just "other professionals".

A thesis isn't just an exam, it's a real scientific paper.

And usually claims is contents as fact, which can be referenced by others as fact.

And absolutely should be open to scrutiny so long as it is relevant.