Yearly subscription?
Yeah I don't think it'll be more than a few months until a patch is released for this.
Apple wouldn't not patch this. The only reason the app was pulled is that it violated their carrier agreements, and the carriers gave them hell.
However, the carriers could trace the data... trace your activity with the company through their internet... and send you a nice letter telling you you're violating your contract and threaten to start charging you for the amount of tethering anyway.
This is what AT&T did with people who jai lbroke to circumvent tethering.