Have you seen Binance's slider?
If there has to be a percentage votes from the community for approval, that might encourage developers to promote their app more. And then we probably should see a percent usage from the apps too, which could be handled by keeping track of which app submits the entry.
Honestly, at first I preferred to restrict upvoting to only Steemit, but apparently people cried about it not being decentralized. So, that's why I suggested approved apps and community voting. However, the proof is in the pudding and things are never really decentralized on a social media app, so I say, that it should ONLY be Steemit with upvote ability and 2FA for verification.