Microtransactions is definitely a winners game for steem in blockchain arena.

What I mean by saying 'weak business model' is that it doesn't appear sustainable at the moment, as it purely dependent on investors.
Twitter has monetisation issues on its own, only generating revenues from ads and promotions only, which is not good enough in my opinion.

EOS not launched yet, so quite a long way to go for it. Proposition is promising, as well as the foundation in steem and bitshares. I'm happy with steem chain for now, I just have a feeling that it has certain content issues, which I'm trying to figure out.