He's not talking about the Badlion Server, he's talking about the Badlion Anticheat (BAC).
My personal thoughts: I think the anti-cheat is good enough as of now, no need to invest money for something they've basically already created themselves. Hackers will be hackers and they will always be an issue.
The BAC is the most accurate you can get for anticheat detection since it’s client side. The anticheat is good but not fast, this will add the speed. And about mac, you don’t need to use BLC. It would be optional. They just won’t be protected by the anticheat without BLC.What about Mac users... this can’t include them due to the fact badlion doesn’t work on that device.