The last step isn’t actually AI – it’s a genetic algorithm. As you ‘favorite’ logos, we apply a natural selection type process to generate more accurate logos as you scroll. Each logo is made up of hundreds of ingredients (ie ‘funky font’, ‘bold color’, ‘logo has a symbol’, etc.) – these are called traits in the context of genetic algorithms.
As others in the thread have already mentioned, the AI referenced in the previous steps seems more like a rules-based algorithm.