I think steemmonsters is bigger :-)
Maybe, tough to get a figure on all delegations, bots, public, and private though. I would say more STEEM has changed hands this way, and no, I'm not offering to calculate :P
there are many communities using this service to support their community which is good.
I know friendsofgondor are, and maybe qurator/sbi/makeawhale?
I haven't looked at the ugly.
This keeps many abuse services in work!