alt Hacker NewsAcquisition happen for 3 reasons.
1. Product 2. Talent 3. Business/growth
In the AI era, some of acquisition happening in the space is for talent and product.
In this case, it looks like it was that. Vite is a great product they were able to build a great team.
You would be surprised how much of a premium companies can pay for talent.
Your listing is not exhaustive - startups can also be acquired for politics, for marketing purposes, whatever. There is a lot of meat space things going on in the upper echelons of the US tech industry.
Recent history shows that an idealized view only focusing on fiduciary duty does not capture the whole picture of business in the USA.