An example (QUANTUM) that became public with Snowden revelations, that is also very old by now (so who knows what their current capabilities are) gives NSA the

An example (QUANTUM) that became public with Snowden revelations, that is also very old by now (so who knows what their current capabilities are) gives NSA the ability to on-demand MITM ANYONE they wish with a minimum of effort. This is just a single actor.