ATT and a number of ISPs offer McAfee for free under the guise of "protecting" the customer. Most IT folks know things like McAfee route all your DNS requests through their servers to filter content, track your requests, and possibly inject ads.
A properly configured firewall (i.e. pfSense) will route DNS requests and filter traffic so ALL clients are protected, not just the clients with McAfee installed. Clients already have enough performance degradation due to Spectre and Meltdown mitigation without the additional overhead of McAfee bloatware.
Biting the hand that feeds IT
