The problem with these "LARGEST WINNERS" is that most are usually sometimes publicity attempts to make the site gain popularity. Most of these betters never come public and its impossible to know whether its the admit betting or an actual gambler.
You do realize that if it was found out that Moneypot's admins rigged the Dust Lottery hit, or that SafeDice's owners rigged the 128 BTC hit, or other crowdfunded large wins were rigged to win by the admins, 99% of investors would divest, right? Their entire business would be screwed and their long term profit site just died because the owner wanted some short term profit and advertising?
Here is a list of BIG wins that took place on
www.bitcoinbetting.website, a blockchain based gambling game offering 0% house edge...
Seems to be more advertising your site than actually caring about this. Also, 1 BTC wins pretty much happen every day at large sites so it isn't impressive.
bitcoinvideocasino wins are almost certainly faked. Look at their biggest winner tabs. If anyone believes that they are paying out thousands of Bitcoin a year just off slot jackpots you probably believe that BetSoft also pays out massive slot jackpots (i.e. high chance you don't actually gamble and are in a signature campaign).
For the largest Bitcoin wins, Bet King will certainly have the largest plays. The only other site that used to have bets of those size (hundreds of Bitcoin at a time) was Just-Dice, which hasn't accepted Bitcoin bets in sometime.
SafeDice had one big win wipe out their entire bankroll, and MoneyPot has had several large winners over the past year. BitDice to my knowledge has not had any big winners (though they have had big losers) for a long time. I don't follow Crypto-Games that much but they recently had a big ETH winner.