> Amazon gave them 7 weeks of advance notice that their content was in violation of their agreement.
Not the same thing as giving them notice of intent to terminate the contract. If Amazon said "some of your content is in violation, but let's work together to improve your moderation, you have nothing to worry about" that does not give Amazon the right to turn around and terminate them after only 24 hours notice.
Parler was in breech. Amazon could have stopped providing service at any point where Parler was knowingly hosting content that violated their contract.
The fact that they continued providing service was a curtesy, not an obligation. For most smaller/ non connected entities they'd have been dropped much much sooner, and likely without notice.
Not the same thing as giving them notice of intent to terminate the contract. If Amazon said "some of your content is in violation, but let's work together to improve your moderation, you have nothing to worry about" that does not give Amazon the right to turn around and terminate them after only 24 hours notice.