Are there easy and widely used substitutes for Cloudflare's DDoS protection? Because a big reason why I think this is bad is because I thought there are in fac

Are there easy and widely used substitutes for Cloudflare's DDoS protection? Because a big reason why I think this is bad is because I thought there are in fact no realistic alternatives to Cloudflare's protection. If there are alternatives, then I am also in the camp of "okay they can decide who to do business with or not". But I was under the impression that, if you are a controversial website, at a certain size (not even that big, depending on your enemies) you are likely to draw DDoS attacks of a severity that only Cloudflare can realistically protect against. The DDoS attacks being relatively cheap for whoever orders them.