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.
You can check the number of visits on 1xbit.com in publicly available sources and compare it to other top casinos.
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?
Could you please tell me what evidence would be credible and satisfactory enough for you?
(I am asking this because I am afraid that whatever I present, you will try to undermine it anyway, and I would like to avoid misunderstandings.)