I’m an AI consultant, client wants me to sign a non-compete

I’m working as an AI consultant and I have a client who wants me to sign a 3-year non-compete that would not let me use any of the generative AI technologies they use in any other commercial or research projects even if it doesn’t compete with theirs.

Obviously I can’t sign this contract. Has anybody come across something similar to this? If so how did you handle it? How common is this?