Why is Proton against using GitHub Issues to create bug reports?

[An-anonymous-coder]

We are happy to answer your questions about the code or discuss technical ideas.

Please complete the following checklist (by adding [x]):

• I have searched open and closed issues for duplicates
• This isn't a feature request
• This is not a report about my app not working as expected

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For the end user, being able to report bugs or request features using GitHub Issues is convenient, but Proton requires the use of a third party service for those. Why is that the case?