I've been using my macbook every day, all day, for two years. How hard are you hitting the keys? Or were you trying to pop the keys off? Because that will break them easily.
Look the butterfly macbook keyboards were defective, end of story. It's not a matter of someone being too harsh on them, they were extremely failure prone compared to other keyboards. Sometimes canned air worked, plenty of other times it wouldn't do anything. Even users who paid $700 to get Apple to repair their screw up and immediately put a silicone keyboard cover over the replacement still had keyboard failure after a year. Clearly they called it a butterfly keyboard because that's how light you have to touch it to keep it from failing. This isn't heavy handed users, this is idiotic design decisions.
Apple put out one of the least reliable keyboards in any laptop that was simultaneously the most expensive to repair. It took them 3 years of gouging customers with obscenely expensive repairs before they were willing to actually admit to the defective design. There's plenty of users on HN alone who suffered from it when it broke right after the warranty ended. If you didn't decide to purchase AppleCare, you got to pay Apple hundreds of dollars to fix their own design defect on a relatively new machine while Apple staff pretended to be completely unaware that this was a common problem.
I'm glad their canned air trick worked for you, many others weren't so lucky. Even today, best case scenario if your keyboard is far gone enough to need replacement instead of canned air, it gets replaced with a new keyboard that's just as defective as the original.
It works. Fixed my 'e' key, fixed my spacebar, fixed all of them. You have to hold it at weird angles but it works.