I don’t like Elon Musk, his buyout of Twitter was horibble and I don’t agree with many stuff he says, that begin said

story about Musk’s father once owning an emerald mine evolved into a larger rumor that had no evidence to support its central claim. Source

No, I don’t think so, two different price because AppStore and PlayStore take cut around 30% when you purchase through them. Meta is passing Apple and Google tax to costumers if they choose.

I think you should read the article

Regardless of where a user makes the purchase, the subscription will apply to all linked Facebook and Instagram accounts in a user’s Accounts Center