Greetings — I imagine this may be a popular thread, I received emails as well.
For all coming and wondering, this is directly in response to Netlify’s new feature rollout, Collaborative Deploy Previews:
To elaborate on that a bit, the new Collaborative Deploy Previews allow viewers of a deploy preview to do many things, but one of those things is to create new (assumably unrelated to the PR you’re viewing) issues in your issue tracker. I’m guessing that’s the reason the Netlify Github app is now requesting permission to create issues — because viewers of the Deploy Previews (when given permission) can create issues.
For further information, please see this other post here in the Forums 
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Jon