When I connected my Apple account to App Annie, I created a new Email address (actually just a simple forward email from my domain) attached to an Apple account which has access to sales data only - and gave that account login to App Annie. When I connected my Amazon account to App Annie, Amazon can create a special access key to my App data which I give to App Annie. Both of those solutions are reasonable and straightforward.
When I try to connect my account to Google Play, App Annie needs my google account password !! To me, this seems completely unreasonable. I would like to give App Annie access to just the sales data, not my entire Google Account. Whether App Annie is trustworthy is not even the point - companies get hacked all the time these days (for example InstaAgent).