I'm assuming you still have your existing email account, eg. Orgs that you know will actively abuse your relationship or the information, that you wish to know as little about you as possible (ps. subscription services/ buy-sell platforms/ websites like this one/ etc. Orgs that don't 'need to know', but with which you will have (hopefully) friendly relations, that will have at least some of your details, eg. Loved ones and people that know you personally and 'in real life'

isp/ bank/ service providers/ trading platforms/ income-related/ government and municipal/ etc. Consider these different contexts in your life, and have different email addresses (plural) for them:

Your comms are now flowing through two endpoints! From a technical/ infosec perspective, by placing any sort of proxy in front of your primary email address you're basically setting up a new email address, and then encouraging everyone to use that to reach you instead of your existing one.

I don't have any opinion on the service you asked about specifically, as I've never used it.

Protonmail email aliases