We've also looked at Lisk (not mature enough in our eyes, development community too small), Stellar (good, but not really applicable for the type of business processes we face), Cardano (same comment as for Stellar and Lisk combined), and Cosmos (not mature enough).

In the end there's really not much competition to Steem's "full stack" - from nice end-user application to blockchain back-end - combined with proven track record of more than 2 years in the Internet wilderness sustaining record number of transactions ...