NASA is a government agency. All photos by US Government Agencies are Public Domain (meaning they have no copyright attached to them and can be used for anything free of charge).
i don't think most people use grammar to impress, but rather to accurately convey their thoughts.
if a sentence is confusing to read, then the reader can be distracted from the concept and pushed into trying to decipher what they are trying to say.
i'd say certain mistakes are worse than others, if the two words are pronounced the same, then the reader can easily read over the error.
I think more distracting mistakes like "than" instead of "then" where, not only are they pronounced different, but can be used in the same place in a sentence, but with drastically different effect:
> this is great news for Snapchat as you are mobile first and mobile only and if the user base on mobile is bigger than desktop (which I think it is by a magnitude or more) than you will be valued more favorably than before in absolute terms and long term at scale you will be more value than desktop companies at scale
he uses than 3 times, one of which (the middle "than") should be a "then", just makes this harder to parse.
TL;DR: if your job is communicating, then grammar is not for impressing, it's for doing your job.
All of the bullshit f2p apps out there generate incredible revenue for Apple. Clash of clans alone generates 1M/day. That's 300k/day Apple gets for doing nothing.
Apple would have to give up that free cash.... Not happenimg.
It means the better your paid install rate (via advertising), then you'll have greater organic installs as a result (usually due to your app spamming enough unwise people on twitter and facebook).
This is a natural result of paid advertising driving installs which the app store uses to rank games in their categories or create recommendations for their landing pages.