If you see someone with a monkey profile picture, you aren't going to download some specialized software and finding it in the blockchain, verifying that the twitter user is in control of the wallet holding the token and finding the artists keys to check the signature is valid and then auditing other chains and other tokens to check that the same picture was not sold multiple times which would involve scraping the URLs and doing image comparisons.
All to verify that this twitter user actually did spend this money for a monkey picture.