I look at it this way, google is already getting my info, I might as well get something from them and using their smart home device is one way. I use google rewords and through itt, I can see how much info google is collecting. For example: I was on the road today and went into a convenience store. As soon as I got home, I got a survey from google rewards asking if I was at a certain hotel today. The hotel happened to be right next to that convenience store.
Anyway, I am still using alexa and fortunately 95+ percent of my commands are for using other smart devices. So far no ads. The only ads I see and it only started recently is on the show. Since I don't sit there watching it, I very seldom see them. I very seldom ask questions and when I do it is on the frames and they seemed to be exempt from ads and other amazon nonsense like btw's.