There is no threat of any particular service being overrun with any particular ideology. That isn't how this works. If the same host is hosting the websites of both Israeli and Muslim groups, neither of them would even be aware of the other being on the same servers unless somebody told them.

Moreover, Cloudflare is the CDN being blocked by foreign ISPs because their laws require ISPs to do blocking on the basis of IP address even though Cloudflare's IP addresses are shared by huge numbers of other customers. It's effectively an attempt to punish international companies for having customers who do something which is illegal in one country even if it's legal in their own country, e.g. some content is in the public domain in one country but not another. It's an attempt to apply one country's laws to another country.

Which is a trade barrier because it prevents a company from serving the customers in both jurisdictions, creating a preference for domestic companies that don't operate in the jurisdictions with less restrictive laws.