Hey, I love Scrimba. A few on our team used it to quickly get up to speed with modern React. There is a lot good I have to say about the React course and the platform! I wrote a post about it recently: https://www.exploringreact.com/2020/09/19/need-a-comprehensi... where I recommend your course as THE React course to do for a verity of reasons and many of them are to do with the Platform itself, although Bob Ziroll is excellent too!
No idea you were in YC. Good luck with it!