Spam is discouraged by the community, including comment spam.
Comment spam is currently defined by @steemcleaners as:
10 or more generic comments per day that are not in response to a question posed by the post or comment. “Thanks”, “Great Post!”, “Great Photo!”, “Good”, “Like”, “Nice”, “Wow”, “Cute”, “Follow me”, etc.
Continued comment spamming may result in action from the cheetah bot.