Well, no, they are just controlling the whole line of delivery for the data packages; its not uncommon in critical infrastructure, that you have to deploy some

Well, no, they are just controlling the whole line of delivery for the data packages; its not uncommon in critical infrastructure, that you have to deploy some special hardware stuff for whatever security reasons. For sure, the typical HN-mentality is: "there is no security and since this a dumb bank/financial-service, they are just trolling and they dont know what they are doing" - no, let me tell you that you are wrong with this assumption: SWIFT is pretty secure and there haven't been any larger (successful) attacks on the network itself (hint Central Bank of Bangladesh losing 90m in a CEO-scam is not a problem of SWIFT, same for similar cases)