Do you think they're going to convert some cash into BTC, or will they just accumulate by accepting btc as payment?
my answer is a big no
If no, why not?
this issue of high volatility and regulatory issues is one of the biggest obstacles preventing amazon from accepting bitcoin, they have their own business characteristics and besides i still haven't heard the amazon owner put at least a chance that amazon will ever be integrating bitcoin which clearly shows that if one day amazon integrates bitcoin it won't happen anytime soon, maybe it will happen in 2 or 3 years
Tesla, SpaceX, Twitter, Square, Paypal, Visa, etc are all adopting, does the largest ecommerce platform not have anything to gain here? I think they're more likely to have BTC than go out of their way to build their own crypto like facebook.
all these companies that you mentioned years ago spoke of bitcoin even if they spoke badly but they spoke it's different from amazon which has remained neutral for years and I doubt they create their own currency