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Anything above 1x is already a red flag for wagering requirement on bonuses? I have no idea how can you say like this while there is no single deposit bonus that comes with lower than 30x wagering requirement.
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Would you share which casinos offer deposit bonuses with low wagering requirement (under 1x) in order to make it a green flag?
in reality there is no red Flag because the conditions are established by the odds you are going to play or specific exclusion on their terms (likewise don't play this kind of events/results ).
example= avoid asian handicap/don't play under 6,5 goals/ don't play third series of this tournament....
If the odds/events respect the criterion that they provide there is no flags...