No. Cloudflare offers different levels of protection. One level is ‘prevent DDoS.’ Another level is ‘prevent bots from accessing the site at all.’ Not all bots are part of a DDoS. The problem is that many website owners turn on the second setting, because ‘bots are bad,’ without realizing that this means that some of their users are going to have to fill out Captchas.

(Comment written from memory, I may have details wrong.)