Can this be a good thing? I'm thinking of turning the internet off while my sister is in a meeting. It seems wasteful to keep it on if she isn't here.
Wasteful? Why? Is there a valid reason behind that decision? You pay for the whole month, don't you, anyways?
Yes! There is a valid reason.
You said you wanted to turn off the internet while your sister is in a meeting, but what if she needs it to do things in the meeting? She will be at a loss on how to get her meeting going right. Then maybe she will loose out on a promotion she needs, so leave it on or explain why you want to do this better.
Oh, I need to put more details into my responses.
This isn't normal, leave it on just in case she needs the internet on. If it is a Zoom meeting at home she still needs the internet for that otherwise it won't work.