I remember very well when the steam has started to receive payments in bitcoin and saying the truth it didn't affected the market.
Because gamers who are bitcoin addicted are not much and the needs for this wasn't too high, we can see that other companies like steam have accepted bitcoin and never affected the market.
I do believe the only market it may affect is the lending service as some people do lend bitcoins taking steam as colateral, besides that some users are ofering those as colateral, something in the past werent possible. In the end it wont affect really the steam accounts market at all, as bitcoin is the same as fiat, soo buying with it or fiat is the same.
I think that it was possible in the past and the fact that bitcoin is accepted in steam doesn't affects much the accounts.
Anyway as far as i know lenders don't take the steam accounts as collateral because they can get back the account by simply saying that they got hacked (at least this is what I have read here in forum)
Unfortunately, Apple does not accept bitcoin yet, nor has any plans at the moment. However, Apple does allow apps to allow bitcoin,
here is a list of apps that accept bitcoin.
They have their Apple Pay and for this decade at least they don't care for other payment meothds neither for bitcoin.