As far as I know, the Polymarket platform accepts bets not in BTC, LTC, ETH, or XMR, but in the centralized stablecoin USDC. This is certainly much better than betting in fiat currency, but the connection between stablecoins and real cryptocurrency is indirect rather than direct.
The wording that you used in this part is not true, the connection between stablecoins and most crypto is direct as possible. Indirect would mean something else, unless you want to define direct as actually using Bitcoin but that would not make sense in the situation of prediction platforms. Because if you define it so strictly then even if they are betting inside the platform using Bitcoin, that would not be direct experience of Bitcoin in the way that it would not feel any different if they were using Bitcoin or some shitcoin like ETH.
How many of these 857,000 people will buy Bitcoin? And how many of them will buy Monero in the future? I don't know... I don't have a definitive answer to this question.
Certainly, using stablecoins is a very important step toward exiting the fiat system. But to fully immerse yourself in the world of cryptocurrency, in my opinion, you need to take another step (for example, buying Bitcoin). And then another step... And another...
That is up to the individual person and not to Polymarket or this situation. Nobody can force a person to get educated about Bitcoin even if you expose them directly to Bitcoin and not a stablecoin instead, many will choose to ignore it or not get any education. So the issue whether people will buy or not does not relate to the exposure to the stablecoin.
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There is some benefit to that from the usability angle, but on the other hand it also increases the chance that normal people will engage in gambling when otherwise they would not. So in the end it is actually better to keep it completely separated and not to have everything on the same platform.
But some betting mechanics will also be different and not like in polymarket of course, It's just the hype of the world cup that will end when the world cup also ends.
The Exchange Platform will definitely not extend this Feature, Convenience will not always provide comfort and security, there are risks as well.
I am not talking about any platform in specific but you can imagine my argument more in examples of other platforms. What would happen if you had a prediction market directly built into Facebook? A lot more people would gamble who would otherwise never gamble, this is why it is very bad to provide gambling elements everywhere, it is very dangerous. I do hope that it stays separate from most platforms, I do not mind some seasonal appearance of extra features but it should not be a permanent thing because of this danger potential. The question for me here is are these people who are just unfamiliar with crypto, or are they also a lot of people who are unfamiliar with gambling? Stories that get hype online about people making money on something like prediction markets is what hooks people who do not have knowledge about gambling, and because of that most of these people will simply lose money and may not come back to use them again.