A website isn’t a common carrier, you cannot argue that a website isn’t allowed to control who they serve their content to. An ISP is a common carrier because they simply act as a dumb pipe between the provider (websites) and the consumer.
Cloudflare is a tool websites use to exercise that right, necessitated by the ever rising prevalence of bots and DDoS attacks. Your proposed definition of net neutrality would destroy anyone’s ability to deal with these threats.
Can you at least provide examples of legitimate users who are hindered by the use of Cloudflare?