Veganism is already healthy, affordable, and tasty. Ever heard of a bean? And only doing the ethical thing when it is also the easiest thing to do is just extreme egotism. I’m not saying anyone has to be a saint, but they should at least put more consideration into their actions than “How does this affect me personally?”

I use my phone as a mobile computer, I almost never make calls with it. No way am I switching back.

I always use less detergent and add some vinegar.

I think it’s ambiguous and the 90% actually makes more sense. If you increase something by 5m you are taking the original value and adding 5m to it. For multiplication you should probably avoid the word increase and say scaled by instead. 10% scaled by 180% is 18%.

That’s tautological thinking and similar to a no true scotsman, language doesn’t contain facts like that.