(I work at Nylas.)
> We already sync several hundred terabytes of data for our users and are adding tens of thousands of new users each month. It’s costing us real dollars.
This is now changed with the new architecture in Nylas Mail.
The same happens for me with ProtonMail. I used the basic service but found that the convenience of a paid plan was enough for me to pay.
I was sort of put off by the look of Nylas though, in regards to the lack of a "native" feel. It was convenient, but I was forced into a paywall before I could really get acquainted as someone who isn't a power email user.
This took a huge amount of work behind the scenes. Stay tuned for the engineering blog post very soon!
"The Basic edition of Nylas Mail will remain free forever."