If you read the article you would know that it wasn't Twitch that accept crypto, Streamlabs did. Streamlabs make it possible for streamers to accept crypto tips. So this isn't directly related to Twitch, let alone Amazon.
Well as i read it combined with the streamlabs announcement the article was based on i read it as streamers using the platform that is the twitch content creators can now accept crypto donations directly to coinbase as any other type of donation. So not connected to amazon in anyway, but still good news for crypto in general. I bet they have people on twitch focused on crypto and technology as well, it's not just a gaming platform as i've understood the twitch model before.