They're absolutely correct; the makers of Adblock Plus are engaging in censorship of digital advertising created by some others and allowing through the digital advertising created by some others, which isn't optimal and thus there are different solutions which do not opt for such fickle behavior.
However, the key part here is that it isn't by force, it's by choice of the enduser of the product; in direct juxtaposition of being on the receiving end of forced digital advertising delivery.
In almost all cases, in order for me to view content, I must first opt in, by only my visiting the site in question, to digital advertisements before I am able (if at all) to disable the advertising through payment. Instead of bitching, we just utilize these tools to (UBlock Origin is my preference) to censor our own content.
I mean, I get it; they are fighting hard to reduce that 30% of Europeans and 10% of Americans blocking ads but enough w/the rhetoric, please.