but the most common multipliers are on 2x and on using neither 1sat -100sats- 1000 sats or depending on whats the most minimal amount that a gambling site do had.
Basing off on experience then i do experience 23-25 losing streak using 2x multiplier and i remember i do have 0.1 btc capital.
So with a starting bet of only a single satoshi, after 23 loses in a row your next bet needs to be 0.08388608 BTC and you will already have spent 0.08388307 BTC. So after 23 losses in a row your strategy would have failed with a bankroll of 0.1 BTC and a starting bet of 1 satoshi and you wouldn't have the bankroll to continue.
To be able to accept 25 losses in a row and still make the 26th roll with a starting bet of 1 satoshi, you need a bankroll of 0.67108863 BTC.
A huge amount to risk given that when you win, you only end up in profit of a single satoshi.
Slightly different since he says he was using a 2.1x multiplier, which due to the house edge of FreeBitco.in gives a ~45% chance of winning. So although still a very unlucky streak, it's a bit less rare than a 67 streak loss on a standard Martingale, but still goes to show why Martingale is a terrible strategy.