Hello!
Thank you for your inquiry. First, let me clarify that using a VPN is not prohibited by Brave. The only issue that comes into play is using the Crypto wallets which notoriously do not allow access with a VPN connection. You can simply turn off the VPN to use Uphold or other wallets.
Your account will absolutely not be banned for purchasing and using the Brave Firewall + VPN as this would be a bit counterintuitive to the fact that it is available from Brave.
The Brave Firewall + VPN service is available for Android and iOS with desktop support coming later this month.
Kind Regards,
Shannon