Quote from SmileI mean yeah it's pretty iconic. Or at least as someone who's watched OPM, it's very recognizable and it's not even trying to be subtle about it. Which I guess would be part of the humor, but it's irritating me personally.
The anime is just mimicking the manga's art style, and the original artist is just someone who draws purposely sloppily and basic, so it's not really intentional. Mob Psycho 100 started publishing before OPM became really popular.