I know, I was thinking about sites like this one. I don't think I'm missing a lot, the internet is huge.
It’s also just one example (search for “shutdown because of GDPR” and there are many more tales) and doesn’t account for future companies that now have to factor GDPR into their business plan and may not (likely won’t?) bring their services to Europe.
Take Facebook, for example: at least for my generation, when you don't have an account, you can sometimes feel like you are a burden for others, who organize everything within it (I don't have one and am doing fine, though).
Or take GMail: the only ways to avoid your private email being automatically processed by Google is either to avoid every person using GMail (well...), or to teach those person to use end-to-end encryption. Not that easy.