Yeah, why not? A quick look at Best Buy and I can see that the Apple USB-C cable is $15.99 and the cheapest reputable third party USB-charger is $13.99. You save a whopping $2.
So if you’re a deal-oriented shopper you’re probably not even going to buy from a reputable third party, you’ll probably go with the $6 one from the gas station of dubious quality. And you’ll probably be fine. Or maybe after 3 months it causes a short and burns your house down. Best $10 you ever saved.
Or you can take literally all of the guesswork out of it and just go with whatever manufacturers cable, spend the extra $10 on a cable that will last you years. The point isn’t buying something Apple branded, they don’t even brand it physically. The point is to just buy something guaranteed to work.
If you can get a much better deal on a Belkin or Anker cable or anything you know is a decent brand then I’d say go for it. You don’t NEED an Apple cable. It’s just a fool proof way to get a cable that you know will work well.