Some people will try, and some scandals will happen, sure. But it is not a widespread problem and is unlikely to become one.
See here, for example: https://velo.outsideonline.com/road/road-racing/tour-de-fran...
Plus if your lieutenant uses a motor in order to pull you up to the front, then your bike is clean.
I only caught the end of that wheel change when I realized the mechanic was holding a Milwaukee cordless and Bob(?) was talking about it.
https://www.uci.org/pressrelease/uci-reveals-technological-f...
Ghost in the Machine [1] is a great podcast on this topic.
[1] https://play.pocketcasts.com/discover/podcast/de6ba1d0-9132-...
But if you're analyzing old races how do you get a conviction? You can't.
No it wasn't. Wheels spin through crashes all the time.
Give me a bike that looks like a normal bike and gives mere mortals like me an extra 5 mph (power law makes that a lot worse for pros).
One of the problems is that bikes can be made so light with unobtainium that there are rules in place requiring a minimum weight so that poorer teams can compete. So if you make a bike that's 10 lbs you have to stick weights into it to bring it up to spec. What else could you put in that bike besides chunks of iron pipe?