He was just pointing to privacy which is a good way to prevent someone from tracking our Bitcoin but the problem is all addresses that we use in the signature campaign are always public there's no way right now to make our BTC private because we already posted our BTC address here on the forum and all transaction are recorded on the blockchain even we keep changing our BTC to any signature campaign it's still public unless if we sent the BTC to other address which they don't know if we own that address where it sent to.
The safest way, which I believe is what most people do here in the forum, is to use either one address for the signature campaign or a different address for it. As long as it's public, anyone can assess it, so it will be very unwise for anyone to make use of their main address, which contains their holdings aside from what they earn on this forum. It's way safer that way, as long as the person also doesn't link it by making transactions often with their other address, which has not been registered here.