It only draws attention if you want to send a conjoined UTXO to an exchange for fiat.
Depositing into a join with kyc'd utxos from an exchange draws attention too
you'd be routing through large exchanges and who knows what kind of logs they're keeping
A routing hop only knows the inbound and outbound channel, not the origin or final destination, can also break that 1 BTC up into multiple parts
From a Sybil of the Lightning network perspective though this reinforces the point you should peer with economic peers rather than arbitrary hubs, there is a centralization trend here that's not good, but it's still less centralized than a join
Depositing into a join with kyc'd utxos from an exchange draws attention too
A routing hop only knows the inbound and outbound channel, not the origin or final destination, can also break that 1 BTC up into multiple parts
From a Sybil of the Lightning network perspective though this reinforces the point you should peer with economic peers rather than arbitrary hubs, there is a centralization trend here that's not good, but it's still less centralized than a join