I removed all my apps from the EU, and I will no longer publish any future apps there unless they become wildly successful in another country first.

My apps are tiny, free, and just not worth the hassle of figuring out what GDPR compliance is (even though they are likely GDPR compliant already since I don't store any info).

I think we're going to see a lot of small indie developers just not publish to the EU until it makes financial sense (which might be never). And that's exactly what happened here: Instapaper is a two-person team and they didn't have the time or resources to ensure compliance, so they just kept letting it slide.

I suspect we'll see much more of this to come for the EU.