The OP is misreading the situation..
1xBet is streaming live matches from severely minor leagues or lesser known countries.
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Nobody saydn1xbet is directly involved in fixing these matches. Only indirectly providing an incentive to do so by opening up gsmbling markets for them.
You cannot limit this solely to incentives provided by bookmaker. Streaming provider, event organiser, league authority, and betting operator, all have responsibility here.
In particular, bookmaker should verify authenticity of any event. Mere existence of a livestream does not mean they can consider that match a legitimate competition.
Another thing is, when suspicious activity is detected in betting market, does 1xbet share that information with integrity monitoring body? Transparency is needed here.
Whether or not 1xBet has engaged in match fixing is beside the point. Rather, it is their responsibility to have conducted sufficient due diligence before creating such market.