We do not allow ads on the service. That would put us in the advertising business, not the privacy and security business. In our opinion that would be a conflict of interest.
The VPN services we know of that adopt an advertising-based model usually have data transfer limits and are likely more focused on selling ads than customers’ privacy and security. Be sure to check their policies concerning privacy and use of your information and we’re sure you’ll agree ad-based VPN services are not the bargain some might think.