Sup TheQuack:  Winning less than one has lost is not considered winning or being successful which is what the post was referring to.  So "Why" is he discounting it?  Because he's not out to shill FBC with unreasonable thoughts.  It's unreasonable to assume that this person won anything at all due to the high house edge of FBC and the amount of LONG time the account ID has been seen (if it was an actual account of course which no one can prove or disprove including you lol).  As you said yourself, the longer one plays, the more LIKELY they are to lose.  So there you have it,  the "Why" of why someone would assume the lost instead of won using your own speeches on gambling and lengths of time.

As for how someone gambles this much BTC,  thats an interesting subject to discuss.  IMO these are likely not legit BTC.  If you take a look you can see that many addresses that have deposited into known FBC addresses come from known hacked BTC addresses (there are monitors you can look at online to see this or you can research it yourself).  It's common knowledge that one of the MANY ways to filter/disperse stolen/hacked BTC is to use gambling sites (FBC isnt the only one that is used for this purpose but it is among the top 3), tumblers, anonymous exchanges,  etc.  They all serve the same purpose and it's mostly just personal preference as to which one someone may use.  The other option is that this isnt a real account at all and is just a dummy account by FBC itself.  All of these are plausible explanations as to how anyone would put this much BTC on the line for next to no return at all.