Unless the data turns out to be fraudulent (ugh!), then 23 & Me seems like it has actually promising products currently going through their development process(es).

nah. 23andMe actually works. they use real science to do genome sequencing, and that's provable. Theranos never worked, and was nothing but lies and hype.

But having working science does not make a successful business plan.

Hmm I am not sure what exactly is Amazon trying to solve for? I reckon only the managers know.. Moving to office-first does not solve the root cause - because it might be some other deep seated issues. If it's really about boosting collaboration and communications in a remote working culture, that requires fostering by the Management especially the company does not start with remote first culture from the get-go.

Just sharing my own experience..I used to work for start-ups and now I am working for a seemingly boring, profitable company that is not venture funded. By boring I meant there is not alot of media news about them. They just bunker down and do the work. There's way less craziness - more focused, mature approach towards problems.

How do I find jobs like that?

These companies do the regular stuff such as advertising via the usual channels- job boards and LinkedIn. And sometimes with recruiters - not those fancy ones who recruit for start-ups.