The Law Firm that I use once in a decade uses Proton VPN and Proton email. It is more of an advertising gimmick. I offered, I rarely do for this profession, to set them up, but they refused saying it will make them a target. I personally did not have any luck setting a free account or it was closed in a few days. I would be very careful with any Swiss claims in general... bullshit is their way of living.