The effectiveness of this strategy is not so much mocking Daesh. The strategy can be effective by adding noise to their signal. This works in live protests as well, this is the electronic equivalent of a protest I saw in college. A white supremacist was giving a speech at a public library in central Illinois. Protesters out numbered actual audience members 2 to 1. They proceed to sing children's songs and play instruments. This blocked the message of hate helping to prevent further recruitment and coordination.