I would argue that some under 250g are not toys and some are. Anything that is above 240 such as the DJI Mini, certainly isn’t a toy as the cameras on them are actually really good.
Then of course you get the industrial quads or octocopters which way many kilograms and they certainly do need a license and a lot of training.
I used to have a heavier drone but now only have the Mini.
Well, these were just my two cents, I am no expert in the field :) 250g is basically my iPhone with a case, so I could hardly imagine a reliable drone with an engine, batery and camera(s) and everything it needs under this limit.