Some of the nicest people are the ones to watch out. There was an awkward situation at my work. Some person fairly high up with grand children was found to be surfing on porno site.

He didn't know that the IT kept track of all the different web sites visited and for how long. What was striking was that the person would have been the last person anyone would have suspected. Tight upper lip no non-sense kind of a guy. He was an extremely painful person for any one to work with and always his way.

So the answer is NO!! No matter how much you trust them or don't expect. They could also access your computer. It's not that hard to do. Give me a few minutes and I can find out your network and some.

Majority of the people out there do not secure their wifi and that is very bad. I've gotten pretty upset with my sister and their grown kids over their cavalier attitutde. Just to prove my point, I hacked into their system and printed nasty gram out on their printer.

And if they did something illegal and the police obtains a warrant to seize the equipment, it will be yours and not your grass eating organic neighbor with hairly arms and legs and walking around in birkenstock sandles.
(I'm a socialist, so I can say such things).

Just tell them that you are nearly max'ed on your alloted Gbytes of transfer.

simple answer is NO!