Here is a comparison which lists some cheaper alternatives to Migadu: https://blog.m5e.de/post/comparison-of-email-hosting-possibi...
One point about your post: Migadu has (or at least had) all the data stored in data centers in France. It also doesn't encrypt data at rest. So I'm not sure how the privacy angle exactly works.
Using a service from a Hindu nationalism supporter goes against my personal world view.
I included the religous connections because some other people might also have similar thoughts.
The money also goes to silent partners, investors etc. so where do you stop?
We should judge people on their integrity and business model imho, religion is a straw man.
That is not the same thing as being religious.