This is far more complicated than it seems. Surely web content created by for example abdraboo is not copyright of Tastyigniter (then any word document would be owned by Microsoft). The MIT license does not require any display in a website footer or anywhere else on a website. It requires when redistributing source code to do all as required which is mainly incorporating the copyright notice, etc in all the code, header or separate files. However, I do not see what harm it can do if anything to keep the footer where copyright of content, rightly, is with the website content creater but where the “powered by tastyigniter” gives credit to the underlying engine and hopefully gets more users interested in using Tastyigniter. Passing off something created by someone else un MIT license raises moral ethical issues and if doing work for someone else may be considered untrustworthy. As one should be able to check the code, it would be obvious who the creater is.