I live in WA (south of seattle) and your description is accurate, there are kids riding around on sidewalks in the area around my house on electric motorcycles that are sold as e-bikes. While I don't personally love it, they kept their distance from my small kids so I figure "let kids be kids". The one instance that frustrated me was they also show up at local mountain bike and skate parks. There they ride up the down trails and destroy a lot of the trail edges, a couple of times I've asked folks to leave.

I was hopeful when I saw the new law that it'll be used as a tool to take action on actual problem usage without punishing those using them safely. Unfortunately I'm aware of the history of laws like this, so I'm worried it'll just be used against lower income / privilege folks. We'll see.