It's there to prevent money from being spent from that address right? But it can receive money right?
Freeze feature is to prevent you spending from your dust UTXOs because dusts can be used to trace your identity by senders of these dusts; and by spending dust UTXOs, you will spend more expensive satoshis for transaction fee.
Dust Attack, what it is, why it is dangerous and how to prevent falling to itFreezing these dust UTXOs to make them unspendable.