As I noted elsewhere, there's an opportunity to do the right thing when someone comes to you and says look, someone is coming in on the control plane and resetting my server passwords.
And yes, that includes looking at your staff especially when bitcoin is in the mix as its less traceable to a person.
For some reason, for year after year, there was this pattern. No problem, we have good security, oh wait, we've been rooted for months. Or someone is coming in on the staff admin plane and taking all sorts of action.
It could be outside hackers sure. But linode never seemed that interested in sorting things out.
The takeaway I had was that you might not notice if a staff person OR hacker was messing around.