That's the way the 3 class law was designed to work. In 2015 California was the first to adopt the "model legislation". They gave companies a year to comply with the sticker requirement. It is supposed to be affixed by the manufacturer or seller and non adjustable by the end user. In addition class 1 and 3 are identical except for the top cutoff speed, 1 being 20 and 3 being 28. Throttle isn't allowed on either. Class 2 is the only ebike class to allow throttle. But many manufacturers and sellers aren't complying and they also aren't being honest with their customers. Whenever anyone mentions these truths in the law, there's an onslaught of comments from people thinking the poster is against throttles. Nothing could be farther from the truth most of the time. Throttles offer a lot of security to many, they make biking possible again. That's even true for a lot of people that ssy they rarely use it, but like the option 'just in case'.
All these issues are why I wish we never had the 3 class law.
Analog bikers call ebikers cheaters, pedelec riders call class 2 riders cheaters. It's all pretty silly when all we want is to enjoy the open air and land we all pay for. Personally I like a pedelec, and i have owned both, but I'm not going to tell anyone what to buy. I try to steer clear of recommending bikes.