Point seems to be that people are switching from gmail to proton for free email, but it's going to be even more difficult if Proton becomes like Google turned out since you'll have to pay to get all the email to your new address while you are transitioning to whatever is next. Instead go to that next thing now before you get "locked in" by having all of your important emails going there. With gmail at least you can forward the emails for free from the places you forget to change your email with at first.