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RichardPSA gives favorable grades to their big dealers. Happens all of the time. Look at 4sharpcorners recent prewar auctions for just a small sample.
As for cards getting bumped a grade, everyone does it. If a card looks strong in an SGC holder, cross it to PSA or GAI for a bump. If a card looks strong in a GAI holder, cross it to PSA or SGC. Crack and submit, roll the dice. People submit cards back to PSA, SGC and GAI for a second review if the initial grade does not look right. All of the graders offer the service to review THEIR OWN slabs.
Everyone can produce dozens of examples of cards crossing at least 1 grade from any grader to any other grader. That's a fact. Why get caught up with a handful of GAI examples.