How have artists over the years EVER trusted that they're getting full royalties from their record companies who can rip them off so easily?

Update: It's suppose to be based on how many records were pressed and/or shipped, and not returned. Right? So whose to say how many there were besides the highest insiders at the record company? Where's the proof? Where's the proof now that so much is downloaded and streamed rather than made in CDs?
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