Especially one that is getting access to all your data. I would expect it to be one or the other. If I'm paying you, I should have absolute privacy.

In this day and age, open source tools are usually more private than their closed source counterparts. Usually. But, they also usually require you to do extra configuration or setup to get the privacy benefits

Agree.

I agree.

I do really like Nylas, it's mostly a pleasure to use.

But I'm using it with Gmail which costs me like $2pm for 100GB storage; the core (with I think 20GB?) is free (at the point of use, blah-blah advertising).

Is Nylas, the thing through which I access my free/almost-free email really adding $12pm value? I'm not so sure.