Well, TomTom says: ". . . Stay up to date with TomTom's Map Update Service . . four new maps each year". You can only read this to mean that if you're not updated you're outdated.
Aside from this, I did not say outdated within 3 months, I said outdated after the 3 months. Worse is, of course, buying a map the day before a new map is published, perhaps only to find that none of the changes to the roads you need updates for have made it into the new map.
I guess my point was that, at the current high price for new maps, TomTom needs to give us a hint as to the areas where route updates are made from one map release to the next. Presently, one kind of buys their newest map and hope for the best. That ain't cutting edge customer service. Many software applications provide a list of changes from one version to the next, so that one can determine from that list if it's worth updating. TomTom could learn from this but, obviously, they wouldn't have those users buying map updates they don't need subsidizing those who do.
As to hacking of maps: As I said, TomTom better shape up and provide leading edge map update service and ditto pricing.
Cheers,
... one3rd0804