Earlier quoted context omitted.
Considering almost every single large tech company is using React, presumably there's not much reason for concern? IANAL. But you're not wrong, preact is a great alternative to react and it comes with a permissive license.
> Considering almost every single large tech company is using React React isn't as popular in the real world as it is on HN.
If y'all think you're going to find some edge case that these companies lawyers haven't already...