When exactly did they add this?

I started off Twin adder and soon capped it out in rank and 50k/50k seals.

Swapped to Immortal flames and did the same thing, I do not recall any sort of Fee, as I would not pay 50k gil to swap GC...

Today I go to change to Maelstrom, and they wank 50k Gil to change FC?

Seriously lol.