They have been actively engaging and promoting Steemit for a long time.
Steemit is considered a rouge platform controlled by a thief.
Users who have engaged in that platform and promoting it are not well welcomed by the Hive community.
These Steemit users started opening up accounts on Steemit, probably thinking that they can make a buck on Hive. This spam of Clean Planet with multiple accounts shows that they think that they can do the same scheme on Hive as they do on Steemit.
His activity on Steemit: