Each time you are adding more immutable data to the Blockchain, which cannot be undone. Each of your identities - to which all of your digital content is tied - is permanently associated with that ID.

So if you just have throw-away wallets, how do you use that with your content? You cannot "own" your content if you keep having to abandon wallets to get a fresh advertising ID. And if you keep several different compartmentalized wallets around, as soon as you move something from one to the other or use a different wallet with the same login, you have permanently and irredeemably linked those identities.