This is a very common question; customers purchase items, then wonder if they need to purchase a license separately in order to use those products commercially.
When you purchase digital products of any kind (not just fonts and graphics, but also downloadable movies, software, e-books, digital music, and more), most of the time you aren’t buying the product itself; you’re buying a license to use the product. This is the case not just at Font Bundles/Design Bundles, but at any marketplace where you buy digital goods, whether you’re getting an e-book from Amazon, or music from iTunes, or software from Microsoft!
Think of digital products like booking a hotel room: you aren’t actually purchasing the hotel room itself; ownership of the room still belongs to the hotel. You’re purchasing the right to use the hotel room according to a specific set of rules and guidelines. The room is then provided to you so that you can use it under those rules. Same with renting a car – you don’t buy the car, you’re buying the right to use that car according to the rules set by the car’s owner.
With digital products, you’re purchasing a license to use them; the files are then available so that you can download them and use them according to the rules of that license.