Earlier quoted context omitted.
And a ton of non-EU companies don't, but are doing so for future purposes. Despite territorial scope, a company without any form of business in the EU, they can't entorce this against non-EU businesses.
FWIW while you're right, that's awfully shortsighted unless you're a mom & pop shop with no intent of ever expanding beyond your backyard. A lot of devs hanging out on HN are working for companies that have at least some B2B aspect. Being GDPR non-compliant means these companies will have to avoid you too, because even if they're themselves not affected by GDPR they may have customers who are and need the compliance…
Calling it a "backyard" is disingenuous. Most companies are going to follow this because they have global aspirations, but that doesn't mean it's impossible... or even all that hard.