Question about brave VPN on PC and android

Brave has partnered with a project called Guardian to provide VPN + Firewall to it’s iOS users. The price for it is $10 which quite high. Mullvad offers their service for $5 with 5 connections, and Protonvpn basic plan is $4 with two connections and $8 for 10 connections.
If add the firewall feature and consider that it has 5 connections it should at most be around $7, $10 seems way too much.

On the main topic, the guardian thing seems to only limited to iOS. Their website does not state that they have created a product for PC and android. The official page says they are only thinking about it and no ETA can be given. So how exactly is brave delivering VPN service to PC and android? Have they patterned with another VPN provider?