Ask HN: Twitter bots are really bad for Twitter?

I have been working on a platform to create twitter bots where user can create their twitter bots with help of few clicks i.e. define keyword, define retweet policy, define favourite policy, define reply etc But I have this impression that people consider twitter bots as SPAM. Do you people really think that twitter bots are just for spamming purposes and bad for twitter existance ?

Is there any useful purpose of creating twitter bots ?

Thanks