Think of it not as a negative thing ("cheap bastards!") but as a cheap A/B test. Now we know how much in actual monetary value micropayments can be based on.
20 DOGE ~= $0.03 (or 3 cents).
Prior to cryptocurrencies, there was no way to test this out in a live setting because money transmission fees would have prevented this on a large scale. Pay walls have to charge enough to cover credit-card fees + operating + profit margin in monthly or yearly amounts (or per hefty per-article fees); perhaps now they can harvest real data to determine whether micropayments would work via cryptocurrencies,
Cheap, live, at-scale economic experiment in micropayments (or micro-tips if you want to be pedantic).