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Is the problem you are describing that CRISPR antiviral therapies aren't effective because you don't usually know that you've been infected until, well, after you've been infected?

The way I understand the problem is that the lag time can be rather long, and it's always long enough for the virus to get a good running start. Symptoms, after all, don't occur until things are well under way. So in the real world, the two opportunities for antiviral therapies are (1) something that you can take long before you're even exposed, and that lasts for a long time (like a vaccine) or (2) something that you can take after you've already realized that you're sick (like an antiviral drug).

It seems like the DRACO proteins fall in between these two unless something has changed since the last time I read about this in, I believe, 2012.