> when BigTechCos buy SmallCos and then unceremoniously kill them off fairly shortly after
There's many reasons, but in general incompetence, malice and small crumbs problem.
I've done my small share of M&A DD work as an engineer, which was a lot of fun, but the results on my sanity and my outlook was bad.
On one hand, you get to go talk to a core founder of a company and they're entirely open to you picking their brain on "Why this" / "Did it pay off?" on pure eV math they did in their heads.
On the other, you see what happens after your recommendation and it is not within your control to change any of it.
Incompetence is generally "Please rewrite this software by our practices" devops hell or "Let's look for better customers for this product, ignore the old ones" in the ICP land. Google and dodgeball comes to mind.
Malice is more clear cut, where "Let's buy it and shut it down, so that we don't have a threat to our business" - I'm eagerly waiting to see what happens with Groq and Nvidia for example. AWS buying Groq would've been massively different. Classic case in point is Apple buying Fingerworks & shutting it down, but launching the iPhone.
Lastly, there's the small crumbs problem (or as it has been famously said "Do not anthropomorphize the lawn mower").
A company can get bought and the product doesn't really add great value to the buyer, beyond getting a few people who really know the space. The small number of people them gets redistributed into a neat set of existing reqs where they just accelerate the existing company's products based on that knowledge or in general fail to surface back to make a significant ripple in the future.
For example, I am wondering what will happen to Promptfoo after OpenAI.