If "you" are a one-man shop, that's fine.
If "you" are the legal department for a company with 10,000 developers, the GPL is scary. You can either blanket-ban GPL code, and make your life easy, or create a system for separately evaluating the use of each and every piece of GPL code you allow in, plus some auditing process to catch cheaters (who check in GPL code as their own work, which happens).
Cloud services companies usually go with the latter: because you don't have to share your code if you don't distribute it, the payoff is good to allow use of GPL code, and police the corner cases where you do distribute code. Blanket bans on GPL code are still common at old-school software companies.
Most non-free licenses are quite scary too, but they often get a pass since they are not that open to begin with.