Amazon are the best people at this as they have the technical ability, vision, and willingness to invest in long term projects.

AWS was not great in its first 5 years. Its capabilities 5 years ago were pretty good but nothing compared to today.

Google is bad at long term development, especially with Ruth Porat at CFO. Microsoft is mixed - for every Xbox and Hololens there's a Courier.

One thing missed in chatbots is that X dot AI is a chat bot that works pretty well. There are others that are similarly domain limited where the current interaction model is an email thread or a text conversation. These tend to be doing well.