When my first startup failed and I was looking for a new role the hardest part wasn't persuading potential employers that I was capable technically, but that I wouldn't be leaving to start a new company in 6 months. That "founder personality" is seen as a downside by employers looking for someone to fill a permanent role. Getting over it, and demonstrating that you're over it is important.

In an industry where 2 year (or less!) tenures seem common, are "founder personalities" really a much higher risk?

It seems a sad thing to have to suppress.

Heavily depends on where they're based, but not having a degree will be a deal breaker, at least in Indian / most Asian organisations.

That's definitely a non-issue in Europe.