When it comes to multiaccount accuse it is alwas a hard spot to settle because casinos are always very secretive about the security measures they put into practice but if there are substantial sum of money involved I think there should be a limit to the privacy motivations that are often announced to end the litigation between player and casino.
the casino RARELY makes a mistake about multi-account accusations.
Long ago I was accused of being a multiaccounter by a reputable casino here ( which of course I wasn't) after winning a contest here on the forum, I waited some days but the prize wasn't arriving, I contacted the manager of the content asking for updates and he answered casino told him I was a multiaccounter.
I think it was a genuine mistake on their side because their reputaton was rather solid ( and they are still around after like 10 years or so) and the money involved were nothing significant.
In that case I didn't even answer anymore cause I woulnd't bother wasting my time to prove I wasn't guilty of anything and lef that casino for good of course.
Can you tell us which casino it was?
I believe that it was a false positive, or the casino admins were lazy to find who cheated and who didn't, because with the contest, we can be absolutely sure that it was exploited by people making multiple accounts.
You're probably asking, "Make multiple accounts to chase a small amount?" - YES, they probably do it.
I didnt want to mention casino name because I think it was a genuine mistake on their side or as you better worded a false positive and I don't want put bad light on them for this.
It happened with Bitcasino.io, just checked closer how things went : it was this
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Bitcasino.ioI then tried to claim those free spins on their site but their code didnt work so I exchanged with their oficial acocunt a couple os private messages which you can see below

So they stated I was excluded from all promotions for bonuses abuses/multiaccounting despite me not playing there anymore for ages : so I let them go considering I was already not playing there and also because, back to the main topic of this thread, it would require so many efforts for me to demontrate something I didn't.
How could I show I wasn't multiaccounting? By what means could I have done it?