Living in Germany, one of the things about DNS-level adblocking is: It SILENTLY obstructs a lot of the payback, reward and coupon programs.

For example, the biggest country-wide payback program is payback.de, and their most of their coupon multiplier links here – https://www.payback.de/coupons/info – will be clickable, but silently not work after you purchase.

Adblocking is good, but I prefer when it's controlled and I can just open an incognito window or disable it temporarily when I need them, for whatever reason.