you could become a manager, escrow, etc its free
yes. offering your service as third person like escrow is also a good way to get bitcoins.
Almost no one use escrow these days most lenders working with colateral,but signatures managers are working with them to get interest into their signatures besides their offer of work.But is very hard to become escrow as its need a high reputation that the most cant achieve or wont,i lend as i see the benefict and i dont need the bitcoins at the moment soo i get a better result here then at poloniex or other exchange with a similiar service.