I'm relatively new and I did start by downloading the app from the playstore. However, since you post links to update from github I've been updating like that ever since. But I have no idea what obtanium is and a quick Google search failed to fetch any relevant results so I don't know that taking it off the playstore would help, but for those of us determined enough, yes, there's nothing keeping us off here... it's just... most people might get frustrated... I was also kinda worried about installing anything not on the playstore but had to get over that fear to get the updates.