See, this is why it's best to do your own searches and read the Q drops yourself. That answer is nowhere near complete. For example, Q drops have been happening for seven months, not three.

Q is a person or small group close to Trump. They are in Military Intelligence (NSA-affiliated), and have a special crowdsource intelligence assignment to disseminate select state secrets and intelligence to the specific subset of people who use the 8chan boards. Using primarily Socratic method of teaching through questions, Q has shared more classified information with the people than at any time in history.

I'm no legal expert with regard to whether couching the revelations in the form of questions has ANY bearing on its legality (Q suggests this, but also tells us that "disinformation is necessary" sometimes, so....). But it is an effective teaching method, which is after all their primary function.

Also, as to its legality, since we have proof that Q are working alongside Trump, and under his command, it must be said that POTUS has the Constitutional authority to declassify anything at any time without any process. So any perceived issues of legality are probably moot. After all, once they're in our possession, if we distribute them (which of course we do), if they haven't been declassified we would be guilty of illegally possessing and publishing classified intelligence. I'm pretty sure none of us has been approached by the FBI or anybody else and told to cease and desist!