You could easily save $138.99 by using Linux.

So the “a” at the beginning can be dropped?

The author gave me the estimate 30-40 Euro.

I guess they need to do some refactoring, as all the other supported platforms will do fine with hardcoded domains.

There seems to be some support for mastodon.social: https://docs.postiz.com/providers/mastodon

You can self-host libretranslate: https://libretranslate.com/