It's not recommended. When not streaming, and even when turned off (actually standby), your DirecTV receiver will still use the internet for some things. The data usage varies, but can be considerable, and there's no way to control it.
AMD Ryzen 5 3400G | XPG SX8200 Pro 500GB M.2 NVMe SSD | Western Digital Blue 500GB HDD | 16GB Corsair DDR4-3000 | Windows 10 Pro 64-bit
I'lI admit I have had good luck so far streaming Netflix and Amazon at lower resolution using the I Pad with Netflix account setting for video quality on low (0.3 gb/hr). Although it uses more than that on some reason!