The GDPR doesn't outlaw tracking. It outlaws tracking without consent.
People will allow the tracking pretty much whenever they have to when not doing so is an obstacle to accessing a website (Or simply because they get annoyed at the popup or it doesn't allow opting out).
uBO (in the common case) prevents tracking even when consent has been given. Subverting that is not against the GDPR because for the law, the consent is the only thing that matters.
