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Can you give some examples (because that sounds interesting, not because I don't believe you)?

Yeah I'd be interested to see the examples too.

Eric Schmidt sat on Apple's board while running Google, but left in 2009 when they became competitors in the smart phone business. Before that, Apple & Google weren't competitors.

This is notoriously playing out in the ETF space. Large institutions own vast quantities in stock in competitors and competition decreases as a result. See Rise of Institutional Investors Raises Questions of Collusion.

Can you give a concrete example? This seems vague. It's certainly not notorious.

Notorious is the wrong word you’re right. It’s an active area of research. It’s called the “common ownership hypothesis”.

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