Huh? Marx Brothers, Looney Tunes, Woodie Allen, Saved by the Bell. All popular shit that constantly break the 4th wall by talking to the camera. And She Hulk and Deadpool have been doing it for decades too.Yes, loads of stuff has broken the 4th wall, but Fleabag is absolutely the reference for the particular type of aside to the camera that is in absolutely everything recently.
And Looney Tunes got it from the Marx Brothers. This type of humor has been popular for over a century in film.And most shows in the modern era got it from Looney Tunes. Bugs Bunny, Tweety and Daffy CONSTANTLY do asides to the audience in those shorts.