There is a lot of Ubuntu hate and it is easy to go with that and repeat.
The Amazon button on the Ubuntu desktop (I believe it was not in the Ubuntu flavors) was removed after criticism.
Ads in the terminal. I've only seen those when using ssh to a server. Ads like the k8 server options of Ubuntu. No flashy jumpy colorful big ads but just small text.
Telling people that there is no difference between installing Ubuntu and Windows is kind of cruel imho. A fresh Ubuntu installation allows the new Linux user to learn Linux and after some time they can decide to go for Arch Linux, Debian (The install is not that easy as with Ubuntu for a beginner Linux user), MX Linux or whatever they prefer.