Is KYC free of cost?

Excuse me, I was wondering if I could clarify something about the Know Your Customer (KYC) process. I understand that it's an important security measure in the cryptocurrency and finance industry, but I'm curious - is the KYC process typically free of cost for customers? I've heard that some platforms may charge for it, so I wanted to make sure I have a clear understanding before proceeding with any transactions. Thank you for your time and assistance.