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And it should be a difficult part of the game. If you're just leaving your own guild with your main to spy on another guild, you're not spending more time to be worthy to get an invite to the guild you wanna spy on. Also, if you're even a bit of a good player, any enemy guild will know you by name. If you're a great player who also plays a lot (meaning invests a lot into your guild) - you will not only be known by name, but you might also be the main target for most guilds. And if you leave your main guild and suddenly decide to switch sides, you'll be under constant surveillance and, most likely, nothing of true importance will be discussed in your presence because that guild will think of you as a spy for the longest time, cause big names don't just leave their guilds.
But leveling up a whole new alt char, giving it high quality gear and putting in time to prove yourself before the guild you wanna spy on - all of that takes time, effort and resources. On top of already putting a ton of all of those things into your main char. This makes spying a very direct hardcore part of the gameplay.
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As a guild leader of over 6 years, of ranging guild sizes and successes, I can most definitely say, if a member isn't doing what is asked of them - you kick them, no matter if they're an alt or not. If a member is doing more than you ask of them - you value them, no matter if they're a possible alt or not. If one player has 2 active characters (from 2 pcs) and can provide guild with everything that 2 people should be providing the guild with - it's more than fine to have that alt in the guild. If that player can't do so - you don't keep the alt in the guild.
And all of those things can be done by the guild leaders w/o any system-based limitation on any given member of the guild. And again, this whole argument only related to the hardcore guilds. Any casual or small guild usually don't ever care about this shit exactly because of their nature. And even if they care about you not logging in 3 days in a row for some reason - THEY CAN ALWAYS KICK YOU.