The Collapse of Blockchain Security: August Edition

Over $720M worth of funds were stolen this month, illuminating a dangerous message about the security and reliability of these platforms- raising several questions. Is orchestrating an attack of this level really so easy? If I happen to be a daring individual with the right technical skills, can I too be the owner of millions of dollars worth of funds? And most importantly, what measures can other platforms take beforehand to ensure they and their users are safe from becoming the next target?