These services run on the blockchain, right? So in effect, there is no blocking them.

Off-ramping to fiat would be criminalised and pursued beyond the wildest dreams of La Liga/Cloudflare. A gambling site you can't withdraw your winnings from is of no interest to anyone.

how's it related to the Cloudflare ?

spain also blocks cloudflare for copyright infringement

To be a bit more specific, some Cloudflare IPs are unavailable for a few hours a week as Cloudflare, compared to other CDNs, aren't responding or acting on legal requests from Spanish judges.

bitcoin

You can block the web user interface and effectively block Polymarket for 99.9% of users. No ban is ever 100% effective.

Prison bars are an unpatched DoS vulnerability that affects all blockchains.

https://xkcd.com/538/