So many questions because you didn't watch the video.

By the team, I mean the main team of each community, creators and moderators.

By steem economy, I mean to buy things using steem, like when people buy the ticket of steemfest using steem and some of them are buying other things.

Sample of apps are : @dtube , @dsound , @busy.org , @fundition , @utopian-io , @oracle-d , @steempress , @esteemapp , @partiko and there are many more if you learn well.

steemworld and steemd are tools , not dapps.