If I have understood it correctly, in addition I have to wager x25 these 100 bucks to be able to obtain a deposit bonus. Not an expert in wagering, but that seems a lot to get these free hundred. I would even say it is rather risky. I would have used dice and set a 95% win chance to get this x25 wager, but there is no dice at bitlucy. Slots - must be very lucky to catch a multiplier, table games - this is always a 50/50 win chance to me.
Well, when you are giving away free money away, there needs to be some requirements otherwise what is the point. So, let's assume that they do 200% deposit bonus, and then they put the wagering requirement to a low place, like let's say 2x wagered, then how are they going to make any profit at all?
You could wager a good amount with a high return, like 90% chance to win, and 90% of the people will hit it and take the money out withdraw it and never come back. That would be a bad idea, so the better one is having rollover, and 25x is not a bad one neither, there are some places that require 40x as well so it could be quite bad for you if it was like that.