As for the millions of websites going offline. Surely, Cloudflare has tons of customers. It's an internet scale company. If they act sloppy and have tons of downtime a competitor might take over. If it's hard to architect a DDoS protection service in a robust way then that's just the world we live in. But I think you should appreciate that Cloudflare sells DDoS protection (their core product atm) without selling you a big package like http serving or root servers.
Current circumstances are a sad and unfortunate state of the internet.
A client deployment of an app, that the client had behind cloudflare was making 80ms API requests take 8 seconds. It's not always great.
I'm not saying that there aren't alternatives, and that people have to use Cloudflare... but there really isn't much in the way of an alternative at even a similar level of support and price on the low/introduction side of things. The issue regarding recaptcha can be REALLY annoying, especially on a non-google browser.