Especially that places like Reddit attract more "tech-savvy" people who have a high amount of ad block users. Naive web ads on places like that or e.g. Ars Technica is tricky most probably.

I think that was the case a few years back, but these days a lot of casual users are accessing it through the official app and getting served tons of ads.

It was a weird moment seeing a reddit comment where someone referred to the site as "this app." Made me feel old.

They need to make the ads and relevant HTML look identical to "real" posts so adblocking doesn't work

This devaluing content to humans, thus breaking what makes the site good.