Great questions, thanks - there is a tutorial!

There's a "bag" just like Scrabble and you're both drawing tiles from it. You can see the bag too, definitely should be visible during swapping, great call.

CPU players have heuristics and different word difficulties they play - I want to do a new post on that soon.

There's no time component... we tried that initially but felt too rushed.

Where is this tutorial? I see nothing on the link nor on wordtrak.com that really explains how to play. I tried to play Daily and I had no idea. I tried dragging tiles onto squares to spell words, no tiles stuck anywhere, gave up.