That assumes you ever even had knowledge of someone else using your phone or computer. Some places people go make them leave phones at the desk, a well funded intelligence operation could infiltrate someone's home through any number of ways or even straight up burglary.
But I guess it's a moot point because if a well funded Intel agency wants to frame you they are going to be able to do it, there's no way to have freedom AND prevent that risk.
That assumes you ever even had knowledge of someone else using your phone or computer. Some places people go make them leave phones at the desk, a well funded intelligence operation could infiltrate someone's home through any number of ways or even straight up burglary.
But I guess it's a moot point because if a well funded Intel agency wants to frame you they are going to be able to do it, there's no way to have freedom AND prevent that risk.