How do you "link" google accounts together?
I guess you want to ask "How do Google link your google accounts together"
For you as the developer, you don't need to link your accounts together because Google will secretly do that for you without your awareness
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So Google will link your accounts together based on many factors:
-You login to multiple accounts using the same computer and the same browser
-You use the same credit card to register multiple dev accounts
-They use Cookie to track you
-And other mysterious factors that Only Google Knows