A number of red flags popped out to me, aside from the dependency on Google
services (which they claim they will remove soon[1])
Readme[2] claims that it requires Oracle JDK specifically, and OpenJDK will
not work. As is typical, they don't explain why this is the case. Now, I know
Java people want everyone to use Oracle JDK as a matter of habit, so maybe it
will work with OpenJDK and they just never bothered to test it.
Readme also states that the installer is built with proprietary tools. This
isn't a problem if you build it from source. It may or may not depend on
Chrome (apparently they removed this in a later version) or it may or may not
bundle a Chromium based UI (which is not apparent).
The project also specifically targets Ubuntu "Linux" instead of GNU/Linux in
general, which shouldn't cause problems but is a red flag for me in general.
[1] https://github.com/getlantern/lantern/issues/1717
[2] https://github.com/getlantern/lantern