ok good for them.

bun, astro, uv ... all acquired.

Ok, what are the alternatives to vite/vitest?

Web components and Jest I suppose.

Esbuild. Rock solid tech.

Hot take (maybe), but I don't think any javascript tool that's reached a critical mass of users is really safe from acquisition at this point. Reason being is that these modern projects are often being spun up as businesses and raising capital, and eventually all businesses in this industry seek an exit, especially those focused on growth and establishing themselves in the ecosystem.

The class of open source developers that thanklessly maintained the underlying packages driving this industry are heading for the exits, and they're being replaced by people who want to build businesses from the get-go. Who's to say this is right or wrong, but I think this is where it's all headed.