The blacklist security enhancement is mandatory to every Bright Data account, and exist to keep the network protected from malicious activities and secure your account from excess charges.
In case your zone whitelist IPs permission is set to 'any', the blacklist security enhancement is automatically applied.
As mentioned in this article, you can remove IP which added to the blacklist by using API commands, or manually from the zone edit section.
In case you like to avoid getting IP added to the blacklist, you MUST add whitelist IPs permissions.
Managing IPs whitelist in the zone can be easily done manually or automated by the relevant API command