What percentage of bitcoin investors are gamblers ? Where will this figure be if we consider worldwide users ? I think it will be somewhere between 10-20% ? Also, it is possible that most of gamblers are still not bitcoin investors ? I see less chances of the later happening.
I don't know where you got your stats from but I can tell that there are more bitcoin Holders who gamble. Gambling can be a more enjoyable thing using crypto. Everyone who gambles on this forum have Bitcoin or uses cryptocurrencies however not everyone one on the forum gambles despite having Bitcoin.
Doesnt matter if they are bitcoin/altcoin holder or not, anyone could gamble anytime and anywhere they want. Its their money and we do have the full rights on what we should gonna do with it.