I don’t know how easy it would be to migrate to your own local machine, but what you’re describing sounds like Desktop-as-a-Service. All of the major cloud providers offer this in some form.

DroidFS has been working well for me. It’s available on F-Droid.

Where is the analytics data supposed to go if you aren’t hosting a service to store it? Are you expecting the author of this free and open source analytics platform to also provide free hosting and storage?

all public bodies must disclose the source code of software developed by or for them, unless precluded by third-party rights or security concerns

So this effectively changes nothing.

This is not a great option for couples that ever touch eachother.

Direct skin to skin contact with the area where the combination gel is applied will result in transfer of the testosterone in the study gel to other people. This may result in increased testosterone levels and unwanted side effects to women, children and other men. Special care must be taken to lessen the possibility of transferring testosterone to women (especially pregnant women), children, and other people you may come in close physical (skin to skin) contact with. Therefore, it is important that you and your partner take the necessary precautions to avoid direct skin to skin contact while you are taking part in this study.

Installing by piping from curl is pretty common and not a red flag in and of itself. Even Rust is installed this way. If you don’t trust the URL, you also shouldn’t trust any binary installers downloaded from that website.