Sprinkle in some security by obscurity; “If we just use our own variant of the algorithm , the hackers can not use common exploits!!” Scare of liability is ano

Sprinkle in some security by obscurity; “If we just use our own variant of the algorithm , the hackers can not use common exploits!!” Scare of liability is another plausible reason. Nobody wants to be famous for picking the wrong default algorithm that exposed the whole internet. Easier to blame each individual user for choosing the wrong exponent or number of padding-bits.