Buying Bitcoin or crypto without requirement of KYC, means more risk.
All legit platforms to buy or sell crypto, do require KYC.
Nonetheless, if you know someone personally who has Bitcoin and wants to sell to you, then you can buy from that person and you pay him cash and he transfers Bitcoin to your decentralized wallet such as Trust Wallet, Atomic Wallet. In this process, you bypass any KYC. If you do the same with a person you do not personally know, you are at risk of getting scammed or even robbed.