Whitelisting source IPs is not required for metered traffic plan users, but it is an optional security feature that they can choose to utilize. However, unmetered traffic plan users must whitelist their source IPs before they can start using their proxies.
There have been instances where bots or applications utilized the task proxies from users' servers without authorization, which necessitated running the proxies without whitelisted IPs. Consequently, unmetered plans are not suitable for these bots as IP whitelisting is a requirement. Additionally, users on metered plans should not have any whitelisted IPs on their dashboard to ensure smooth operation of the bots running proxies on their servers.