Earlier quoted context omitted.
You're not understanding how lossy compression encoders work. Try recompressing a JPEG a few dozen times. Or take an MP3 and export it from Audacity, open the export, export as MP3 again a dozen times and see what it sounds like. All those artifacts keep getting amplified every time you re-encode until it's practically just the artifacts. Every time you render and recompress you're losing information, it's lossy comp…
Thought for sure it was going to be the legendary Hank Hill JPEG meme: https://www.youtube.com/watch?v=QEzhxP-pdos
Truly a classic.