>Godot, Unity and Construct are all examples of tools that are both easier to learn and less costly in 2020 than Flash authoring tools were in 2006.
I don't think this is true at all. Making something in Flash and publishing it even back then was easier to me than to use Unity or Godot today. The latter two tools are much more powerful, but way more complex.
Also, you linked a game maker's toolkit gamejam. Of course they're going to be playable in the browser. I would consider that to he easier to use (or at least on par) than Flash.
Unity 2020 reminds me very much of the shockwave authoring tools.
Game Makers Toolkit is just the name of the youtube channel that hosts the jam. Not the name of a tool anyone used for it. Most people used one of the three tools I named. You're probably thinking of Constructor, which is the third one I named and is indeed easier than flash was. But I think recent Unity releases have surpassed my memory of the flash tooling I got to use. Tough to say because I don't have the old shockwave stuff around anymore to do a side by side comparison.
In most of the itch.io jams, browser games are strong. People still do downloads too, but the winners are almost always HTML5/WebGL playable. You just get drastically more plays (and therefore more ratings during the contest) if people don't have to install things.
I think a lot of the creativity you used to find on Kongregate really has gathered at itch.io.
I don't think this is true at all. Making something in Flash and publishing it even back then was easier to me than to use Unity or Godot today. The latter two tools are much more powerful, but way more complex.
Also, you linked a game maker's toolkit gamejam. Of course they're going to be playable in the browser. I would consider that to he easier to use (or at least on par) than Flash.