If you receive a donation through the Ethereum anonymization contract Tornado Cash, everyone can see that and since the contract is also used by sanctioned states like North Korea, all funds going through Tornado Cash were put on a sanctions list (pretty easy since they only needed to sanction the contract address). Monero is different in the sense that it has privacy by default and while you might be able to point out that some criminals use Monero, you can't really prove it directly with the blockchain like you can with Tornado Cash.

Imagine the government sees that a ton of people, including known terrorists were all sending credit card payments to the same guy, who mixes everyones money together to hide it's origin (now he is the origin though) and now money from that place of origin is used to fund attacks on the government but also to donate to kids with cancer. Of course the guy will have to be arrested and all the money that went through him marked as sanctioned.

Monero on the other hand works as an independent version of cash, not tied to any nation but instead governed by cryptography and code, which are protected by the First Amendment. If a government doesn't like Monero, they can still easily make access to Monero very complicated via laws that prevent centralized exchanges from listing it, and they do, but outright sanctioning the whole network could be very, very hard and might literally be impossible without trampling all over free speech laws.