It was fun. Later I discovered 2048, and it was also fun, and felt like a bit of a different game to me.
The author's reaction to 2048 rubbed me the wrong way a bit. https://asherv.com/threes/threemails/
Thankfully fans of 2048 pushed back and most decided that it's a simple enough game that you can't really expect there not to be clones, or clones of clones. I like this one: https://mdjorge.github.io/doge2048/
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Edit: From the post about Threes:
> We do believe imitation is the greatest form of flattery, but ideally the imitation happens after we’ve had time to descend slowly from the peak -- not the moment we plant the flag.
Fair enough. Things moved too fast for that back then and they move even faster now. A coding AI could help create a ripoff.