@ronane Well, trackers are *usually* front-end, so it can be blocked. But yes, back-end trackers exist as well and can't been seen (for GDPR complains) or blocked by users so that's a risk.
I'd be suprised if meta doesn't already provide backend trackers to shitty websites that don't care about users rights…
But again, containers (in general, not juste meta…) mixed with µBlock are still useful and even required