Apple has made it clear that no matter how a developer chooses to sell or distribute an app in the European Union, the TestFlight beta distribution system will remain available.
Much of what was covered has already been gleaned from existing, albeit sparse for now, support documents for developers. However, one point was less clear — the fate of TestFlight for developers not using the App Store for distribution.
Up to 100 internal testers, and 10,000 external users can test an app. Builds can be shared by email, or by the distribution of a public link. Builds last for 90 days on a user’s device without redownloading, but a developer can “expire” a build in advance.