you're right, but the problem of spam is a commonplace of all web portals.
At least on steemit there is the possibility of having curators of your posts, this is a very positive thing.
However, steemit is still a young platform, if it will emerge worldwide, improvements will certainly be developed.
Good start of 2018 🎇🎆👋👋
RE: Plagiarism and copyrights - how to avoid problems on steemit