True, when there is no deliberate cap stated, it's unmetered, not unlimited, meaning you can use what however much fits through the pipes (usually best effort instead of guaranteed bandwidth), and that's the natural limit. A 1 Gbit/s link for example will get you close to 300 TiB in each direction in a 30 day month if you are able to saturate that link 24/7, while a 100MBit/s link will get you a tenth so "only" close to 30TiB.