People also confuse themselves into thinking records with no samples still don't take from other records(interpolations), or have 4-10 writers/producers put their touch on them and have the same payout system.
These are nothing more than the expenses of recordings. The only time any of these become legal issues is when things aren't taken care of before record's releases. That can range from a sample not being cleared to a producer not meeting an agreement, to a song sounding too similar to another, to someone who's voice is off in the background because of a bad take that was usable or only giving minuscule input like "that last kick should be removed" feeling their contributions made the song a success. There's a chance of any of these incidents anytime music is released, not just with samples.