Why would it hurt you? They're at the forefront of technical challenges of scaling an immensely popular product and developing internal tooling. These aren't necessarily applicable everywhere, but they're incredibly valuable. If anything, I think the fact that they're working at a place where a very vocal minority of their peers jeers at is a positive signal. They can withstand a snarky comment from some hipster at a party to potentially work on interesting technical challenges (money is good too).
> - selling your company to Facebook/Meta or product on it hurts your brand and perceived to be immoral
I think you're in a bubble. Facebook is a very popular brand name outside of a very vocal minority of internet commenters and tech journalists. They have a few of the most popular consumer apps in the world with 3 billion total users across the products. When you consider their products in open source like GraphQL and React, it's even more.
I get it, you don't like Facebook. But don't gaslight yourself into thinking they're some toxic entity that everyone hates and is on the verge of irrelevance