As a researcher, I am very happy that recently all the conferences and journals we usually publish to champion open access publishing. Due to this, all my work is currently FOSS and all the papers open access. That is a great change to the papers of the past where you have to have an affiliation to a university to get access to a paper and sometimes even that is not enough.
Aegis is so great especially because it allows you to set an automatic backup every time you add a new TOTP. This way, a backup is made immediately after modifying the MFA vault, stored in your phone storage, where it can be grabbed by your synchronization system of choice (e.g., Syncthing), replicating the backup on your other devices, for example. This way, you can rest assured you will always have your MFA vault no matter what.
K-9 is rebranding as Thunderbird for Android, indeed. But since many users of K-9 expressed their desire to keep the logo and name of K-9, Thunderbird agreed to publish both versions: one rebranded as Thunderbird for Android, and the other keeping its original branding as K-9. We will see whether that will complicate things for Thunderbird team too much yet.
Beside concrete suggestions, I would suggest having a look at the applications you use. (Decide whether you actually use and need them first.) Search for the application on AlternativeTo or similar sites and look for a FLOSS alternative there. And also search the internet for general FLOSS replacements for the use-cases of the applications you use. No need to rush anything. Even replacing one application a week is good progress.
People are starting to comment on the topic and take notice? That is great to hear. It is not often that this happens when such a study is released. It might be that ordinary people who lack the knowledge on the subject may be able to comprehend the concerns regarding privacy in cars more readily than in other areas. Whatever the case is, I'm happy the discussion is finally happening.
While I disagree with you, this made me chuckle. A great joke. Wish you all the best.