Here is my experiense:
1) I bouth 30TH/s 90Days BTC(SHA256) contract Feb 14, 2019, $127.47, 0.03543304 BTC (included 10 days Electricity Order);
2) I payd electricity orders:
Feb 18 - 10 Days - 30.00 USD - 0.00809201 BTC
Feb 22 - 20 Days - 55.80 USD - 0.01406888 BTC
Feb 28 - 20 Days - 55.80 USD - 0.01458396 BTC
Apr 8 - 20 Days - 52.60 USD - 0.01103462 BTC
Apr 21 - 10 Days - 29.10 USD - 0.00557221 BTC
3) Total contract received from BTC.com pool: 0.10755910 BTC
4) Income: ~50% (clear income 0,01877438, by start invested sum 0.03543304 BTC, because I payd electricity from income mostly)
PS Bitdeer is very risky and can become scum very soon
$127.47 / 30*90 = 0.04719259259
I also think that i can get into loss very fast when the StrongU 660gh's asics will be shipped out. i wonder if anyone here got the first batch i could not find a thread
Also, that is X11, not SHA? https://www.asicminervalue.com/miners/strongu/stu-u6
Furthermore, it seems that Bitdeer is very close to Bitmain and Antpool, which makes it pretty likely that most of their farms ARE in china, right?