Just a small 30% of the top 10k sites.

Needing to find solutions to a problem completely manufactured by sports and television is the problem.

Cloudflare is a private company, they might (unwillingly) benefit from hosting illegal services. They don't implement a quick or proactive process to take down content that is obviously illegal. The money made by illegal streaming websites doesn't end in good pockets, which raises further concerns. Such streaming is quickly spawn for the event, then disappear. Even if you fight them legally after the event, they operate from countries that won't cooperate.

Cloudflare could change their policy to take down quickly obvious abuse during live events. They could proactively check new customers before allowing public traffic.

People can vote against protecting property if they think it creates unreasonable effects.

Not sure where you got your stats but top website owners can easily deploy technical solutions to this issue.

We live in a complex word. This problem is not completely manufactured by bad people at sports and television companies. What should right owners do? Accept that content they own is streamed illegally, for profit, and not use recourses the law provides?