Earlier quoted context omitted.
Well, if WaPo makes a distinction between subscribers and non-subscribers for this behavior (I'm not sure if they do or don't), they they are very clearly giving you a choice for how to pay for your content, with your money or with whatever information that can get out of you, and to that end they don't want you to block that because they actually want to get something of value out of the transaction. > I think it's…
When you pay with your money,i.e. subscribe : you enable them to get more information out of you. Tracking becomes almost perfect : no matter how many browsers you change, operating systems, keep deleting cookies, give random data to finger printing : they can track you with your subscriber ID. So paying is a double whammy.
The simplest way for WaPo to achieve this without having to deal with any adbockers or trackers would be to use an in-house system served from their own servers. Unfortunately, since they also have a free subscription where they do track people, that would mean two systems which would be redundant, and the in-house one also probably takes a lot of effort and manpower. Unfortunately, that leaves subscribers not knowing exactly what is being tracked and who is doing the tracking.
I mitigate this by using ublock and a container tab for news sites in Firefox. I would prefer to know this isn't needed because WaPo did the right thing, but I would still do anyways, as just because something shouldn't be needed for protection doesn't mean you shouldn't do it anyways if the cost is small enough.