This is a bullshit answer. Your design language is the worst and cannot be defended. Amazon has literally all the money. Hire a team, give them the mandate and listen to their suggestions/solutions. Asking for spec work is some serious bullshit.
"Don't like it, make your own... if we like it we might start using it! Then you can say you built the AWS icons for free, I'm sure that will be great for your career"