By not revealing their own identity and try to as private as possible.
Let's get the definition of influencer.
someone who affects or changes the way that other people behave:
There are many influencers in this forum and they never reveal their identity, although theymos likely have their IP address. Still, I don't know who're them, their face and so on.
o_e_l_e_o is one example of Bitcoin influencer, he taught me many thing about decentralization and non custodial, he influence me to use non custodial wallet in order to support decentralization.
These influencers are paid handsomely by Theymos for staying active in the forum and bringing more important persons into the forum, too. Although Theymos would not want to make it open to the forum, who these members are. o_e_l_e_o might be one of them, another member I think, is an influencer in the forum, is JayJuanGee. His knowledge of Bitcoin is beyond comprehension. There could be more of them, but whatever, only Theymos knows, as you rightly said.