Every centralized exchange is required to do AML/KYC on their platform if they want to do it to prevent money laundering and the SEC penalty. That means there is no legit exchange that will run an IEO on their platform without asking the KYC to their costumer. If you do not want to send your KYC, do not participate in IEO but find ICO.
there are many projects do not require you to send your documents to participate in their sales.