Do not track says "gee Mr Website, will you be nice and not attempt to monetize my traffic". It doesn't mean a damned thing.
You should pretty much assume that everyone on the internet will track everything about you they can at every chance they can get. You should assume some greedy asshole with an MBA and a tendency to be a sociopath doesn't give a fuck about your desire not to be tracked is making the decision to obey no not track.
Do not track was an industry attempt to distract people from regulations which would have tried to stop them.
Do not track is a complete fucking lie.
Don't be all surprised now to find out it doesn't actually do anything or hold any weight. Which is why you should be actively blocking as many of these things as you can, instead of relying on the kindness of some greedy sociopath asshole who doesn't give a crap that your browser has pathetically announced it doesn't wish to be tracked.
Hell, do not track, when ignored like we know it is, just gives them another point of data. I don't even set it, because I know damned well it's not going to do anything.
When a company publicly says they won't respect do not track, you can pretty much assume every other company is already ignoring it anyway. There is not do not track.