Good catch. They were all off the top of my head based on a lifetime of studying the game industry but not having the time to dig out citations for everything. They're mostly google-able, a few GDC "year in numbers" slides can show you the trends you're interested in. I'm probably off by a few years here and there. It was all just to illustrate the point that things are changing fast and not stopping, which I'm confident will stand.

The irony of complaining about a lack of sources without sourcing your own claim seems to be lost on you. Here, I did the work for you:

https://www.businessinsider.com/amazon-buys-twitch-2014-8

There's no reason to be mean about it. You could have just politely provided the citation without the condescension. You made it personal.