of course there is a server with steemit.com that does'nt live on the blockchain, it calls the data from the blockchain, but i've seen 503 errors which is normally load issues on the webserver end, imagine hundreds of thousands of people loading the webpage all at once. why would steemit run well with grammarly. it will not be designed for the way that text is displayed on steemit probably so the problem is not with steem it's with the plugin from grammerly. you could always just write in grammerly and come back to steemit to post.