Seems their top brass have a weird tendency to make public antiprivacy statements:

Criticisms and controversies

Infomaniak has been criticized for controversial statements made in a Linkedin post by founder Boris Siegenthaler, where they opposed online anonymity, criticized free privacy services, and argued that requiring ID to use online services and mass metadata collection is acceptable. On TV and Radio, Communication Manager, Thomas Jacobsen, criticized the stance of privacy companies who publicly opposed a Swiss surveillance law, stating that their advocacy for online anonymity would "prevent justice from doing its work".

Wikipedia

I have tried Infomaniak. Extremely hard to understand their control panel! Very high learning curve. But that has maybe changed since last time I had a subscription (before the pandemic).

Now I use Posteo and I love it.

Fastmail won out, Infomaniak was my second choice.

I host my own Nextcloud so I only needed email.

I would like to test before paying, but since I am in Brazil, I cannot test. I will not pay without knowing the product first..

I'd ask the same, to me they work so great, and they have a very green conscience

I’ve been using Infomaniak products for the the last few years and I’m very happy with them.

My only complaint is that kDrive isn’t available as a Flatpak and that Linux is a bit of a second zone client to them.

They also have a really good reputation regarding social and ecological behavior.

Their datacenters are heating buildings in my city.