Hi Julie,
It's been getting harder and harder to sideload anMoney over the years so in my view it's only a matter of time before Android blocks it entirely. To be fair to them it is a 13 year old app at this point.
R.e. my app, from what I've read about the hoops new developers are going through they're not making accounts "in good standing" go through the same hoops. I've had my developer account for over 15 years, published multiple apps, and not had any issues so hopefully won't have a problem publishing this app when it's ready.
I disabled the Firebase Testing signup link as we have 30 people signed up and I wanted to try and manage the number of testers so I'm not overloaded.
However, I should have a public testing release on the Play Store soon, which you can sign up for here (it's not available just yet though):
David