Earlier quoted context omitted.
The article is the question though, the question deserved to be asked. And Gmail deserve to be shamed for shipping almost a gigabyte of stuff for a mailbox. Wouldn't be surprised if they accidentally/intentionally built the whole youtube client in there.
I think this might be closer to the truth than you might think. Due to the absence of (cross-app) shared libraries on at least iOS, developers often end up building big company-internal libraries that then have to be shipped with all of their apps. Tree shaking isn’t perfect, and the result are these > 0.5 GB monstrosities.
Google needs to trim some stuff down.