It seems strange to describe it as a "non problem" when he's successfully evaded something like a billion dollars in taxes. Romney did the same. Certainly many others have as well.

Thiel bought his shares at $0.001/share in the same round where the company was valued at $0.20/share. At very least, he should've been capped at 10,000 shares in the IRA but instead he contributed 1.7 million ($2k/year IRA contribution limit at the time).

It's like describing a software bug as a non problem since it only lead to two intrusions.. that you know of.. that cost your company a ton of money.