We’re prioritising bot-like features in the Direct Messages API at the moment, and I know you’d previously said that is what you’ve been looking to use. However, we do still have automation rules - we issued a policy clarification here recently - and our machine learning antispam systems will detect some of these kinds of repeated content messages.
Are these repeated identical message to the same user, or different ones? Do they include (for example) any URLs?
You’re welcome to choose the platform of your preference, and we apologise if you’re finding our systems to be problematic. This is good feedback as we iterate on this aspect of the API.