Personally I think bonuses like this are truly awful!

The wagering is insanely high for a phantom bonus. Using your figures for example:
Deposit $100, play with $500
WR = $500 x 25 = $12,500
Expected loss playing av. 95%
RTP slots = $625
Then, after theoretical
WR, they remove the $400 bonus.
So your $100 becomes:
$100 - $625 - $400 =
-$925
In other words, unless you are EXTREMELY lucky (getting an
RTP of
over 100% on your $12,500
WR) you are virtually certain to lose.
IMO players should only take this type of bonus if they just want 4 x more playtime for their buck, or fancy some high-rolling, and are happy with having just a tiny chance of making a cash-out.
KK
PS: I have taken a couple of these myself!

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