Maybe it's actually the end of this filehost.
I guess their servers are pre-paid, so the cost of these months is from the revenues we generated some months ago.
Now they just want to make use of the remained months to generate additional revenues without paying affiliates.
Once their servers are expired, files will be gone one after another.
I can remember some filehosts closed their affiliate programs but had been still alive for a long time.
I don't think the cost was out from their own pocket; a more reasonable truth is that servers are pre-paid.