I’ll bet my left nut that you don’t have a male USB-A to female USB-C adapter that can support fast charging. So you’ll still end up ordering one from Amazon - a local store is unlikely to carry one.
USB-A to USB-C is the current standard. I am convinced they include a USB-C to USB-C cable because most people don’t have those chargers, so they’ll be more likely to order one with their phone.
It should be noted that setting Adguard as your DNS will allow Adguard to track the domains you visit. The latest info I can find is that a lot of their team is still located in Russia, which makes them susceptible to government demands regardless of their intentions.
DNS adblocking should be the last resort. On Android there are many ways to do system wide local adblocking (with and without root). Don’t know about iOS. Alternatively you can do network level blocking with something like a pi-hole.