Hi Wendy,
To be clear, I‘m not advocating investments here.
In many jurisdictions, cryptocurrencies are considered custody assets, just like securities. I.e., you can hold them at brokers or exchanges without facing counterparty risk as they wouldn‘t end up in the exchange’s bankruptcy estate.
If you want to buy or sell say Bitcoin the exchange would normally have your cash on its balance sheet at least for a brief period, with you (possibly through intermediaries) incurring counterparty risk.
Funding with a stablecoin gets around that problem.
Of course there still is issuer risk - i.e. the stablecoin may not be as stable as the name implies. Possibly governments will get into that market one day.