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A sector that is related to identity verification, fraud analysis, and money laundering detection can not be handled by one or two people. And yes Roobet might be able to afford the team to manage regarding the sector. But it came back to profit, what decision is the most efficient yet profitable for the company? Well, it's absolutely to use the third party, not to mention, the data they all already have for the analysis.
I believe there is no "just in case" reason. Running and choosing business decisions should mainly get the most profitable case as possible, so choosing a third party for identity and fraud management is actually predictable and favourable in business aspects, even not merely because of security reasons.
many end up choosing a third-part platform that in my opinion it's probably the best option
though these companies are almost all the time based in locations like hong kong where compliance is not so strong
ends up that if someone submits documents to KYC websites they'll never know if it'll stay there forever or not
Seon is based in Budapest[1], while Veriff on Estonia[2]. So I don't know which third-party platform that Roobet use whose based in Hongkong. Identity and platform analysis should always be compliant with the applied regulation anywhere in the world, so I believe if you care enough to read about their own privacy policy, there will be a piece of information that addresses your concern.