While I want to disagree with you on the general principle (and gen220's sibling comment points out several really nice longer-term examples), I will certainly admit that you have a point. Cloud providers eating the margins, investing in streamlined operations and in general making the earlier on-prem consulting work less attractive has had an effect.
But I do note that your examples are from quite a narrow sector. TypeScript, Go and React are all languages. TypeScript is a nice facade over JavaScript, and React is ... well, a very powerful DSL.[ß] Go is very much a Google project, developed perhaps more out in the open than in a traditional open-source sense.
As I understand, TensorFlow was originally an internal Google project, which they at some point decided to open up. It may have had something to do with their TPU cloud offering or not. If we wanted to compare low-level language or domain material, we should probably take a look at something like Boost. People who do C++ tell me that Boost is a pretty good approximation of C++ standards' evolutionary playground. And if we're going for new languages, shouldn't we also include Rust? It was backed and promoted by Mozilla, but how much of its development was driven solely by Mozilla, and how much was done by the interested community at large?
ß: Our frontend team will probably want to roast me for that one, but there isn't much visible JS left in modern React code. Not for my eyes, at least.