Money sinks. $60 marriage packages, $30- $40 ships, a lot more casual outfits with random colors, more random colors you can buy to make the outfits actually bearable, automatic health/shield charges that become a necessity, paying to use global channels, etc.
I doubt it's going that far but Pay 2 Win is already here.
It would have been better not to allow Atari/ Cryptic to get its hand on the IP. A company with a decent stuff and achievable goals might have served the game much more then the fast shot it is now.
Although the game has come a long way since release much of the problems from then still exist. KDF is still a hollow shell and even the Feds are not as good as they could be.