Amazon has every incentive to write down Twitches infrastructure cost as far higher than it needs to be, to make Twitch look unprofitable.
Both to audience and shareholders. It'll allow them to force more advertising and push up sub prices while making the main corporation revenue look better.
This while the long term plan looks to be more about getting an excuse to shut down the public facing side of Twitch and get rid of having to deal with the streamers and viewers as direct clients and renting out streaming infrastructure to other streaming sites instead.
They want to condense their streaming services to simply be simple products they can sell or rent out to other sites rather than having to deal with a load of consumers and legal liabilities that come with them.