@Alberto1574 If there is a restriction on how much data guests can use, that should be stated on the listing, however, it's probably the case that this never occurred to the host, as none of her past guests have ever used more than some average amount. A guest motoring through an average month's worth of GBs in 2 days was I'm sure rather shocking, and had the host had to pay for that, would likely have meant she ended up providing you with what amounted to free accommodation.
Just because a host includes something in their listing doesn't necessarily mean that guests can just freely use up as much as they like. For example, a host may offer a washing machine and dryer, but that doesn't mean it's okay for a guest to do 3 loads of laundry a day. And while all hosts provide a place to bathe, that doesn't mean it's acceptable to run up a huge electricity bill by taking two hour long hot showers every day. Hosts provide heat and AC, but that doesn't mean it's okay to go out all day and leave those utilities turned up to the max, heating or cooling an empty space.
Airbnb is often a learning experience for the hosts and the guests. I think you did the right thing by paying up, and I would bet that the host will add some clarification to her listing re average internet use going forward.
And as a guest who uses vast amounts of internet data streaming and gaming, it would be wise and respectful of you to make this known to a host before you commit to a booking so you ensure that your needs can be met, or if the host would want to charge an additional fee for anything over a base amount of GBs, and how much.
I also offer free internet, but my internet is metered and expensive, so I do make that clear in my ad- fine to check and write emails, surf the web a bit, but definitely no streaming, gaming or uploading or downloading large files. But I was well aware of my internet capabilities and costs before I started hosting, so I was able to make that clear in my listing from the start.
