You must leave as few clues as possible. That's the only rule.
You have to talk to people sometimes; it's inevitable. There are orders to be given, shipments to be arranged, people to be killed, etc., etc. You cannot exist in a vacuum, for goodness' sake.
You need to ring François Loubet? In an absolute emergency? You'll get a phone with a voice-changer built in. And, by the way, if it's not an absolute emergency, you'll regret ringing very soon.
But most communication is by message or email. High-end criminals are much like millennials in that way.
Everything is encrypted, naturally, but what if the authorities break the code? It happens. A lot of very good criminals are in prison right now because a nerd with a laptop had too much time on their hands. So you must hide as well as you can. You can hide your IP address—that is very easy. François Loubet's emails go through a world tour of different locations before being sent. Even a nerd with a laptop would never be able to discover from where they were actually sent. But everyone's language leaves a unique signature. A particular use of words, a rhythm, a personality. Someone could read an email, and then read a postcard you sent in 2009 and know for a fact they were sent by the same person. Science, you see. So often the enemy of the honest criminal. That's why ChatGPT has been such a godsend.
After writing an email, a text, anything really, you can simply run the whole thing through ChatGPT and it instantly deletes your personality. It flattens you out, irons your creases, washes you away, quirk by quirk, until you disappear. "ChatGPT, rewrite in the style of a friendly English gentleman, please." That is always Loubet's prompt. Handy, because if these emails were written in François Loubet's own language, it would all become much more obvious. Too obvious. But, as it stands, you might find a thousand emails, but you would still have no way of knowing where François Loubet was, and you would still have no way of knowing who François Loubet is. You would, of course, know what François Loubet does, but there would be precious little you could do about it.