Almost any software project from Google with some kind of user-facing API seems to fail, because Google somehow sucks at API design. Like how awful to use Tensorflow became, leading to it getting largely replaced by PyTorch. Or how complex and convoluted AngularJS was, compared to ReactJS which replaced it. Google's design philosophy seems to be the polar opposite of Linux's "Don't break userspace", so I can see why application developers wouldn't trust a kernel written by them.

Dart itself is another example: it started similar to Typescript, but Typescript quickly grew to surpass it in every way. Because Typescript eagerly learned from modern programming language theory, while Dart stuck to Google's "try to make everything like 1990s OO" approach.