Chinese concept stocks, can I still buy them?

Can we still trade Chinese concept stocks in the US stock market? It's definitely not advisable to trade anymore. They've all started short selling, collateralizing, and taking out loans to buy stocks. Can we still trade this? The market will collapse as soon as the government intervenes. Anyone suffered losses from these Chinese concept stocks? Let's create a discussion group, everyone add me to join! $Alibaba (BABA.US)$ $PDD Holdings (PDD.US)$ $Meituan ADR (MPNGY.US)$