The interesting thing that a lot of services don't consider is that blocking these cookie banners is perfectly allowed and does not implicitly allow services to collect personal data.
Twitter is one of those service that just states "we collect data, deal with it when using this website" (which is already not legal) but the thing is, I don't even see this pop-up because uBlock is filtering it out. If Twitter now collects my personal data, it is not only breaking the opt-in component of GDPR but also doesn't even notify me about data collection.
Quite a lot of services have JS-only popups which I also don't see. Do they collect data? I think so. Do they know they are doing it illegally? I would bet quite a bit of money that they never thought about somebody getting past their cookie banner without consenting, so probably no.
(This is assuming you're using uBO, because who the hell isn't these days?)