Designers today are largely driven by trends (just like engineering?). Being cool = jumping on the latest bandwagon, not being unique or better. The good news is this particular style is pretty much restricted to tech companies, I think it started with https://neon.tech a few years ago or a similar startup.

Incidentally, the same behaviour is seen in academia. These websites for papers are all copying this one from 2020: https://nerfies.github.io/