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But, there are going to be people who will download the app and after they have gotten the money they will sell their coins and then leave the wallet to back to their other wallets that they have been using.
Such a practice is common and the government of El Salvador must have thought about it. Of course some real data verification will be done on wallets issued by Elsalvador, it won't be that easy to earn $30 with multiple wallet accounts. Verification of the original data is still required.
Not being forced to use an official wallet, of course, has a reason so that cryptocurrency users in El Salvador are saturated and have other options for using different applications. But what makes it interesting and must be used is the $30 reward for those who use and verify the data in the chivo wallet application.