I imagine there were 2 primary reasons, one financial, one personal:
Number of heavy users (including a lot of mods) would’ve forced Christian to implement an open-ended cost model based on individual usage, or raise rates across the board to compensate, making it ultimately cost-prohibitive for the average user, and/or
Not wanting to communicate (by folding) such a change was okay. To move to a blanket cost model is to basically admit that you’re okay with and accept the changes.
Some might say it was pure stubbornness and greed, or conclude his decision was a bad one. That’s its own topic for debate I guess.
InB4 “Uranus seen in true colors for first time.”
Really though, I don’t know why it never crossed my mind that the picture of Neptune was so… saturated. It’ll take a little bit to reconcile this new perspective of a “light bluish-green” Neptune. It’s just so jarring to alter a belief held since my childhood.