Is the quality bad because the airlines just don't care when the Wi-Fi signal gets hugged to death or because it's hard to offer a stable connection at those al

Is the quality bad because the airlines just don't care when the Wi-Fi signal gets hugged to death or because it's hard to offer a stable connection at those altitudes? I fly with Spirit a couple of times a month and tried their $6 Wi-Fi service which straight up never worked both times.