I please kindly wondered for any advice on a few of the most popular No KYC decentralized blockchain-powered cryptocurrency exchange please that kindly accepts Amazon Gift voucher as a payment method and does not need an initial deposit of bitcoin to start using the platform please?
There are no decentralized exchanges that are offering what you are looking for.
Some services are selling gift cards for crypto, like Bitrefill, thebitcoincompany, Noones and others, but I am not sure about them purchasing and trading cards.
Please don't give suggestions if you are not sure if some websites have kyc or not.
There is no way of using Paxful without kyc for some time:
https://support.paxful.com/support/solutions/articles/150000104290-limits-and-verification