This is actually exactly what Brave does! Both for Canvas and WebAudio, which is also used for fingerprinting in a similar way.
There's more info here if you're curious: https://brave.com/privacy-updates-4/
There's more info here if you're curious: https://brave.com/privacy-updates-4/
Here is Brave's take: https://brave.com/brave-fingerprinting-and-privacy-budgets/