Ethereum is not good for privacy.
To give an example:
When you pay with ethereum in a store, the shop owner knows how many dollars you have in your wallet. In addition, since shop owner learns your wallet address, he learns how many dollars you will send to which addresses (addresses anonymous) with that wallet address in the future.
For another example, if you send money to your friend via eth, he will be able to see the activities in your wallet and amount in your wallet since he learns your wallet address. Therefore, we cannot assume ethereum as a good cryptocurrency for privacy.
This is probably why monero is recommended here.