Thanks for your contribution @valued-customer! For REP I mean "a better REP system" (i.e. as @blocktrades is working on). Also a REDPOS uses a combination of human activity related parameters.

You could let an account "age", but then again, it's just one parameter. For it to have a REP greater than 25, that account needs to have some sort of activity. It needs to be "worked".

So such an attack costs more and is harder to execute than the current attack going on STEEM. I'm just proposing a definition of what a REDPOS protocol would be, I'm not a coder. It relies on a well coded REP system, the current one has been defined as a "bandaid" arrangement.

So a REDPOS implemented with a better REP system should be stronger than a REDPOS implemented with a bad REP system.