These are all fine in the US, but in other countries not carrying proof of identity can get you into some trouble, as can refusing to talk to the police. Know your local laws.

uBlock Origin seems to be included in the whitelist, so I'm sure the point of this isn't to show you ads.

A FreeRTOS derivative has gone through the effort of getting certified for safety critical applications, but that derivative is sadly proprietary. Even if FreeRTOS itself can't meet that bar, though, the work wouldn't have to start from scratch.