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.
You are right, not what about people that are well known. In France, Ledger co-founder father was Kidnapped. The hardware wallet company, Ledger Nano is located in France. So people there know the person and Kidnapped his father for a ransom which should have been in crypto payment if not that they were found and arrested by the police.