If you're not running a multi-million $ site, you're especially screwed for alternatives unless you're selling something and can get affiliate revenue.
If Bob wants to put up a video fixing vintage washing machines, he'll have to do it out of 100% altruism, because Google is going to take all the ad revenue.
Google have a fair number of monopolies. Just not using Google products is obviously not a viable option in many situations.
(Not that I recommend using it. I recommend the old fashioned ways of knowing where your banner ends up. And make sure it doesn't become one of 344 on some random site. So build partnerships, etc. Yeah, it sucks, it's work.)
Does the Amazon belongs to that list? All I have heard about Amazon support was only positive. Did you had different experience with Amazon?
No warning.
No explanation other than "suspicious activity" or "violation of [vaguely worded] policy."
No human to call who can help troubleshoot, other than a tech-savvy friend or relative.
No recourse.
There needs to be a technology bill of rights, not just for people dealing with Google, Amazon, Apple, and Facebook, but also the myriad other technology operators which can disrupt our lives in an instant with some poorly programmed process or unanticipated edge case. Ultimately, the OP or my non-tech savvy employee or my mother should be able to get real answers and/or help from a human being when wronged by Google, a telco, or the local bank.