They no doubt do not have the resources to manage a 'free for all' beta test. And from a lot of the posts I read, the questions would often be " When can I get Orea final 8.01?" and the like instead of the detailed information the team require to actually fix bugs.
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Xiaomi Wanted Tester for Stock Oreo 8.0 Beta Program for Mi A1. Here comes a chance for Mi A1 users to test Stock Android O. Do you have interest in joining ? Click the link below and then submit your application.