As popularity of this product (electric vehicles posing as bicycles) grows, expect legislation to only increase. I hate to appeal to authority, but as someone who works at a bicycle manufacturer, I can assure you the legal implications of these bikes are a subject of daily conversation.
Why do you expect legislation to increase beyond what it currently is (which, in most areas, means it's fine on streets in bike lanes, and prohibited on sidewalks/mixed use trails/etc)?
It seems like there are actually laws on the books in most areas, so it's not a loophole existing because nobody thought of it. And in general, 750W/20mph seems entirely reasonable, as that's less than what a typical in shape cyclist can do (maybe a bit better on hills, but nobody really seems horrified at the thought of a bicycle doing 15mph up a steep grade).
I think we've uncovered the reason for the negativity. Perhaps we can move on now. :)
I have nothing at all to do with bicycle manufacturers, and I also think it's a silly bike that's going to be exceedingly poor at doing just about everything except making the people who came up with it a lot of money.
- It's not a useful on-road commuter with those tires.
- It's not legal on most mixed use trails as an ebike.
- It's not powerful enough for sand/snow/gravel.
- It's a fixed speed bicycle, so you can't even assist the motor efficiently outside a fairly narrow range of speeds.
For a $500 purchase cost, it might be a decent toy. For the $1200-$1300 expected retail, it's not worth buying. And for the $150+ they're charging for shipping, even at the intro price, you can build a much better ebike for that money.