If you have attached only a receiving wallet then yes, you can receive sats but cannot send them to others. My understanding is that if/when you send them to others they will be debased into CCs.

You need to attach both a sending and receiving wallet to both send and receive sats and avoid them being debased into CCs.

More and more people are demonstrably only bothering to attach a receiving wallet but neglecting to attach a sending wallet.

This undermines the BTC denominated circular economy that SNs is trying to achieve.