Split tunnel is a thing, and in that instance the platform required to comply (like a porn site) doesn’t have any way to see all your traffic to determine if it’s a VPN/proxy connection or not.
Under Utah's law as written, a private business has to assume any single IP address could be operating a VPN/proxy.
With cross tunneling all your normal traffic would go through your ISP usually and just your porn traffic goes through the VPN. Unless it's a major provider, as far as your ISP is concerned you're just connecting to someone's private server occasionally