Bug reports sometimes also contain proprietary code that help Apple pinpoint the bug. If you worked for a company and were working on a brand new software product, would you want your competitors to have the ability to search bug reports for your email address (or all addresses at *@xyz.com), knowing that you are having trouble with a specific API?
BTW, Apple Developer Relations has updated its privacy policy for bug reports where data you submit will be deleted from inactive bug reports after a period of time.
A private bug tracker also means that Apple can use the same bug tracker to collect reports about devices or functionality which isn't available to the public.
Bug reports sometimes also contain proprietary code that help Apple pinpoint the bug. If you worked for a company and were working on a brand new software product, would you want your competitors to have the ability to search bug reports for your email address (or all addresses at *@xyz.com), knowing that you are having trouble with a specific API?
BTW, Apple Developer Relations has updated its privacy policy for bug reports where data you submit will be deleted from inactive bug reports after a period of time.