River is fine as long as you withdraw to self custody after you purchase.

With bitcoin well you can purchase bitcoin and have it automatically sent to your wallet without holding the corn on the exchange.

Robosats is a great option for non kyc purchases.

I was looking for a place that could send my Direct Deposit to cold storage, and Bitcoin Well came out with that feature not too long ago. Cash App and Strike offer direct deposit but the corn lands on the exchange instead of custody.