Completely different issues. National Security letters and DMCA requests are for discrete, time bounded data points and complying has effectively no impact on future operations (unless you decide to shut down instead of responding like Lavabit did).

GDPR however requires that you actively set up data auditing and security policies and practices which may break or otherwise require re-architecture of parts of your company. In fact that is it's purpose. If the company or organization is small enough, then it might be easier to abandon the project instead of being compliant.

In this guy's case he had an easy offramp to reddit, so he took it. Simple. However it does offer now at least one data point to show that GDPR has decreased diversity in data ownership and risk. The question is, are drone.io users better off now that they will be utilizing reddit?