Doesn't look like Bitdeer was shut down, their twitter account is quite busy the past few days.
Bitdeer is still mining, don't know if they have got their hashrate from somewhere else or it's actually their gear but they do mine blocks:
https://blockchair.com/bitcoin/block/690253https://blockchair.com/bitcoin/block/690241https://blockchair.com/bitcoin/block/690231https://blockchair.com/bitcoin/block/690208It could be that BTC.com is lending a part of their hash rate as the coins to a btc.com address or there is some kind of other deal behind it but they at least have something that's not only on paper. One thing, did they always had those 720 Days packages or it's my memory too fuzzy at the end of the week?
As for the difficulty, I think we have finally hit the bottom at the start of the week, it's starting to go slowly back up, and there is an influx of S19j Pro available right now with prices well below what we had for a few months.