My guess is that Netflix is tried to cultivate a semi-premium brand (but not premium in an Apple TV+ way), which means getting rid of the long tail in favor of what's hip, sexy, exciting, etc. Whereas while Amazon is making expensive boondoggles like Ring of Power, they are also comfortable with keeping dozens of conspiracy theory documentaries on. I guess that's in line with the identity of their main store, and the concept of Amazon being a series of warehouses.