This is a good example of where a strong belief in something (in this case Apple greedily taking a huge cut of developer earnings) that something that sounds patently false is believed automatically and instantly.
Happens with people, companies, religion, and politics.
And the thing here is that this tweet contained a single fact that could be disproven with a little additional information. Now try to imagine how many false yet popular beliefs there are in areas like politics or economics where you can spend your entire day counter-counter-argumenting in circles.
Agreed. Generalizing based on assumptions is very useful. Using those generalizations (e.g. assuming the apple thing is true) to reinforce beliefs is incredibly harmful
Happens with people, companies, religion, and politics.
[edit: I believed it too without thinking]