No one can stop your ability to post. They can only remove rewards and potentially reputation. What you are seeing is likely a node issue or a transient network issue. I know api.hive.blog has had a few issues recently and may be related to your experience as it is the default node.

I personally use peaks.com as it is far more feature rich than hive.blog.

As for Hive Watchers, they will frequently try to verify people are who they say they are as plagiarism is very common where money is given so freely. The reward pool is a shared resource and what one person does affects every other stake holder in some way. It is not an easy job as it is so easy to prevent to be someone else to gain rewards and little can be done to truly know for sure.

Just to put things in perspective. I just happen to pass by and notice this interaction.