Once the inflation ball starts rolling, primarily by the oil/ energy suppliers, everyone jumps on the wagon, so they are not left behind. Even those who do not need to raise rates/prices take advantage of the increasing profit margins available. Watch Wall Street for upcoming reports of record earnings/profits, especially within the companies at the top.
Of course, the turd rolls downhill so some price increases certainly are necessary to stay in business but, there is a lot of greed in others. AMA costs may have risen some, probably in the magazine money pit, but I view it more as climbing on the wagon.
I recently began cancelling subscriptions to streaming services and some internet services, some with 20-25% price increases. Explain to me how their services demand that other than plain old greed!