Apollo did a couple of short production runs on scooters that used VESC (Apollo Pro Ludicrous and Apollo Ultra Ludicrous). You might check on the soon to be released 60V Apollo Phantom.
As far as modular hackable scooters go, that’s a tough one. I agree with Jacob that we’re seeing more scooter-specific parts these days which has pluses and minuses. The plus being that they are designing the part to do exactly what they want it to, and they can tweak it and make it better in response to customer feedback. The downside is there will be less interchangeability between brands. Ultimately I think the purpose-built stuff is going to end up being really good.
But, I’m also curious to hear if anyone finds a production scooter running VESC.