That really isn’t the culture at Amazon. There are all-team meetings that happen all the time, and every now and then there is a reminder that “hey we’re gonna be talking about an interesting topic so you might want to join”, but it is certainly not a mandate or expectation that everyone will join.
Different companies have different cultures. Weird that people can’t grok this.
Being "asked" by your boss to attend an optional meeting is pretty close to being required, it's just got a little anti-friction coating on it.