Yes, there are some VPN apps that do offer adblocker feature. Pop-up ads are too annoying & dangerous as they can also be adware. Not just this, but it also slows down the browsing speed. And that’s why some VPN apps block the ads to improve the connection speed. These are some of the Android VPN apps that blocks the pop-up ads: PureVPN CyberGhost Private Internet Access Surfshark NordVPN TorGuard Encrypt.me Tunnel Bear