Gmail likely has most of your emails due to the fact that many people use it. See for example this analysis[0], where the author says that over 50% of his email

Gmail likely has most of your emails due to the fact that many people use it. See for example this analysis[0], where the author says that over 50% of his emails have transited on a Gmail-owned server. [0] https://mako.cc/copyrighteous/google-has-most-of-my-email-because-it-has-all-of-yours https://mako.cc/copyrighteous/google-has-most-of-my-email-be...