They can revoke the license yes but then it will depend on where the site is hosted on whether or not anything else can be done. Hence why I said due to the small staff of employees it would be hard to really enforce such things. The other sites the OP mentioned have huge amounts of staff...
Well for one Twitter, Facebook, etc are all hosted platforms and they have huge employee/volunteer bases to help keep things like that off of their site.
xF is a self hosted platform and as such they can’t really truly control what people do with their software. As such xF doesn’t have the...
I would suggest next time using an FTP program such as FileZilla and choose the overwrite option and you shouldn’t have any issues. I would suspect that most people use an FTP program instead of an IDE program.