It doesn't seem that hard to setup. My grad school does free weekly surveillance testing, takes less than 5 minutes. I could see why airlines would want to avoid the disruption caused by crew members finding out they're positive in the middle of a trip, possibly in another country, but it does seem odd that our current policy that doesn't allow us to fly while waiting for asymptomatic surveillance results discourages us from getting tested regularly which kinda contradicts FAA guidance and common sense.