I don't think anyone does. Its rarely a thought-out malice. It's more of unexpected things that happen because no one thought or cared to safeguard against that

I don't think anyone does. Its rarely a thought-out malice. It's more of unexpected things that happen because no one thought or cared to safeguard against that, or because such safeguards would've broken some legit feature or business model. Like that E2E vs spam filtering issue explaination from GMail engineers.