The fallacy in which someone believes that they were capable of building something before an already more popular version of a product has come out.
In many instances this fallacy is contained by engineers working at companies or in academia in an indirect attempt to belittle the success of founders, claiming how trivial it is to build said app. It can also be a feeble attempt to make up for their unrealized internal inferiority complex. In reality they might have been able to code it, but not conceive it's details, key features, and brand identity.
George suffered from the I could've built that fallacy for weeks after Snapchat received an offer from Facebook for over a billion dollars in talked about acquisition. He built his own version while working at Google, but it only had 5 users. He was happy he didn't quit his day job.
zazpowered
I hear this so often
SingleCommaClub
Agreed