There is no guarantee that stable coins will be safe, learning from experience in the LUNA case, even stable coins can collapse if the main support collapses. I only use stable coins that have been proven to have a strong foundation, such as BUSD and USDT.
Stablecoins will only be safe if the issuer releases proof that they hold assets equivalent to what they put out in the market. They can easily write whatever figure they wanted written in there and people won't notice until someone in the group calls them out for it. Even big names like Binance and Tether need to be audited for their assets and their stablecoins. You cannot create money out of thin air, and it's easy to do that on stablecoins without a sweat, you just have to have some followers and a very promising and catchy offer.