Came here for the same reasons.
If there's no way to remove the new ads or the new "Upgrade" button while paying for a subscription already, then will be time for me to move away form Avast. Though would be good to also be able to disable the "Mobile" button as that's just another ad.
It's understandable to have those ads on the Free version, but not when you're already paying.
Here's another ad in addition to the one for the VPN.