Maybe there is an issue with this slot.
68 spins and no win
This HAS to be pretty much impossible, so maybe there WERE wins, but autoplay failed to recognise them & stop.
Normal
WR for MG casinos is 300 credits wagered on slots per 10 credits moved from bonus to cash. 60 moved would normally take 1800 wagered. If wagering just over 2100 credits meant 60 was moved to cash, this is pretty close to the default, where 2100 wagered would move 70 over to cash.
I suspect a near clone of Cashapillar here
Cashapillar has 100 lines, and at first was thought very low variance because of this - it wasn't
68 spins without a win though, this is extreme even for a HIGH variance slot.
There are probably some high winning opportunities in the feature, and these might represent a very significant portion of the RTP for the game.