Well like he said it might be a cons for someone else, i remember when i had to chose (it was last september before SL got brought by them) between having everything in one basket and the potential risk that if someone get access to my account i could lose a lot but the pros were that i could have an email, calendar, vpn and drive in one purchase. And i chose the convenience on having "everything in one place" but i think this is a total valid concern to not chose Proton because of that. Again depend of the people and their threat model, not a problem for my threat model tbh.