From memory there's a fee in order to publish an app the the play store so I would assume they're circumventing that by hosting the app on their own website. You could also upload the app to virustotal and see what that says if you are concerned.

I'm not a big video editing guy but I have used kdenlive in the past and was happy with it

Yeah Ive been using it to access some reddit pages, not all of them worked but enough did for me to get the answers I was after

I mean he's not really wrong some subs are already opening back up, without indefinite closure nothings going to really change