I quite disagree, it is very hard. Sure, switching search engine takes all of two seconds, and email can be had from many vendors free and commercial.
But calendaring! A calendar that is at least somewhat integrated with am email client, supports more than one actual calendar, and has real-world capability to share them with others - "if you succeed in this, two me how."
(not sure this worked as intended. I meant to reply to https://lemmy.world/comment/1748023)