Well @jfang003 and @anderssinho already mentioned what was in my mind but to add -

1. It is not sustainable approach too . Very few people might want to hop on to different front-ends to just earn Engage .
2. The community tokens should prevail , this particular project aims at increasing engagement from different frontends - please note that it is the key here . Whereas ENGAGE is for everyone irrespective of any frontend . The usecases for both of them are different .
3. I might add various other features in future like ! WINE for the top user , ! BEER for top user in SPORTS , ! ENGAGE for top user in STEM etc etc but I can't move ahead with just those , it is not sustainable .

I hope it answers your question .