People that stacked ProtonMail
I switched to ProtonMail from Gmail. Still have Gmail but don't check it. Gmail emails get forwarded to Proton and I action by either unsubscribing, putting into spam or replying from my new email. Eventually there will be no new emails to my Gmail. More private and independent.
Being a privacy-first company, our team uses ProtonMail as our email provider. It's not as convenient as GSuite and you miss the integrations third parties provide, but you must decide what is a priority for you: your marketing tools or your users' wellbeings.