There are reports of unlisted ai stocks being used as a form of payment to purchase homes, prompting warnings from experts about potential bubble signals. Some investors are betting on these unlisted stocks, and there are examples of individuals using them to buy expensive homes, although this has led to tax scrutiny in at least one case. The use of unlisted stocks in this way is drawing comparisons to pre-financial crisis patterns, but the extent and implications of this trend are not entirely clear.