Senders are the only part of Monero that uses decoys. The only part that is obfuscation.
Amounts and recievers are completely hidden with zk and encryption and don't appear on chain at all. The transaction graph doesn't exist like it does with Bitcoin or Liquid.
Liquid: Alice sent $[?] to Bob
Monero: 6% chance Alice sent $[?] to [?]
And the upcoming Seraphis upgrade will replace sender privacy via ring sigs completely with full membership proofs.