This confusion was really super clear to me back when they were rolling out 1.45.x: 🧪 Help testing the upcoming v1.45.X release - #12 by kinetix
It’s almost like the app should now be forked in to two differently named apps. One that is geared toward what people understood DeltaChat to be - a nearly-instant chat client that utilized already existing email infrastructure and accounts as the back end, and the other being a chatmail service that is, of course, completely separate from already established email infrastructure.
There is now no obvious path in the client to set it up using an already established Email account (If there were, the Create New Profile page/screen would ask for your email address, not your name and a default push to nine.testrun.org), and heavy weighting to get users to use chatmail by default.