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that shouldn't be possible at all. If we for example have an account on steemauto then steemauto has our keys if they need to log them . If steemauto makes a account on Streemian what can be connected in serveral ways Streemian only has the info of Steemautos account..

If Streemian was able to access the database and grab everyones keys from another 3rd party that simply had an account on Streemian. Then there must be some huge mistake going on in the background and a breath of confidence as both parties are responsible for the safeguard of your information.

But it feels highly unlikely that streemian was able to get all the keys connected to steemauto just by them having an account on streemian. ???? were is the logic ppl.

(PS i am using steemauto as an example. can be any service for that matter)

Take it easy.
You followed user A
and user A used streemian
then if user A upvote by streemian
You will follow user A's upvote.
That's all.
steemauto or streemian don't need your keys, they use your account's posting authority!

That is clear?
(PS. steemauto is totally free.)