Such an accusation against such a large casino like 1xbit is pointless! These amounts do not cover even part of the costs of a signature campaign.. Come on!
How do you define a large casino? There is no concrete evidence to suggest that they have a large number of active players.
But it doesn't matter. What matters is that despite their efforts, there won't be any results from this forum. You keep asking for a scam accusation with a deposit of more than $1000, but can you show us at least one positive review with a withdrawal of more than $1000?