Developers often use TestFlight to send out pre-release copies of apps to testers and members of the media to suss out bugs and usability issues ahead of the release of an app. TestFlight is simple to use, requiring just an email address to send out beta testing invites, which has made it popular with developers.
Prior to today, app developers were only allowed to invite up to 2,000 individuals to beta test apps using the TestFlight beta testing platform, a limit that was put in place in 2015. This is the first time the limit has been increased since then.Now you can gain even more valuable feedback by inviting up to 10,000 users to beta test your apps before you release them on the App Store. TestFlight makes it simple to invite testers using just their email address and lets testers quickly provide feedback within the TestFlight app.
Article Link: Apple Now Allows Developers to Test Apps With Up To 10,000 Users