[alphabettsy]

That’s not necessarily true. Many founders end up selling products or services to the companies they previously worked for. I know of more than one person who left a previous company to pursue something that started as a side-project that many of us were aware of long before their departure and wished them well. There are plenty of places where if you’re getting your work done people are actually reasonable and nice, at least my experience with startups has seemed this way.

[fibonacc]

Many founders seem like a doubtful choice of words. There are even more founders that have landed themselves in legal waters because they just assumed their employer would be understanding like them.

High risk of failure, high risk of litigation if we took your questionable anecdotes without any proof at face value and suggest to OP to do the same.

This is especially true for large companies with people who are hired to handle litigation and IP risk management.