You can. The problem is that they're changing them to actively and intentionally circumvent the expressed wills of people visiting their site.

I'm allowed to move my arms like I want, but that doesn't give me the right to push people off cliffs.

Very poor metaphor.

The will of the (informed) visitor doesn’t matter when they are visiting a place. I can’t have an intention to take a painting from a museum, ranging about the museum making it hard

Should we also ban sites formatting their pages so that you can't easily block their ads?

That's changing the topic and avoiding the question.

It's also further defending hostile dark patterns and evading explicitly expressed personal intent.

The browser is a user agent, not a publisher or advertiser agent.

Yes, this kind of tricks by corporations.

I believe the problem is not the ads but the tracking.

Formatting pages to make ad blocking difficult is another example of websites making a conscious choice to thwart user intent.

In both cases, sites are attempting to tie content consumption to content monetization, and users are attempting to get the content without the monetization because they dislike side effects of the monetization.

Most websites track users. Even if they don't try to monetize content or show ads.

you're ignoring political purposes, and the political engagement of even the most vocally apolitical orgs. and you're ignoring abuse of access granted through neglect

Intent matters.

Many sites do this very intentionally, including Facebook. Look sometime at the markup on their "sponsored" disclosures

I would be in favor

I guess they should just be done with it and say if you don’t opt in don’t use FB.

Not when it impacts peoples' right to privacy and control over their own data. Do you work for Facebook?

I'm all in for making this kind behaviour illegal by big corporations which is used by large population.

This is a bold opinion

The times I've seen these corporations doing cunning harmful actions, I've left with zero sympathies for them.