IggyTheSmidge

I don’t have a Windows 11 machine available, so I can’t get you the exact command, but this should get you there.
It should remove it from all users on the laptop, and (hopefully!) prevent it from coming back:

Open Powershell and run:
Get-AppxProvisionedPackage -Online | Where-Object {$_.displayname -like "*Copilot*"}

Copy the Package Name entry and run the following command, with PACKAGENAME replaced by what you just copied:
Remove-AppxProvisionedPackage -online -packagename PACKAGENAME

Yeah, I’m running LineageOS with MicroG, so I tried disabling Android System Webview as a test. ReVanced seems perfectly happy to browse/play videos (though I didn’t try logging out). The only apps I have that fall over without webview seem to be eBay and Amazon, so no great loss there.