Why do I always need a verification code when I speak in Baidu Post Bar?

Baidu Post Bar needs verification code:

1, the post bar level is low. If it is lower than level 3, you must enter a verification code. If you are above level 3, you will no longer need your speech verification code.

2. Post frequently for a period of time, and the system authenticates by inputting the verification code.

3. Not a member of this bar. Members of this post bar can enjoy the privilege of no verification code.

4.ID uses posting software to spread bad information such as advertisements and viruses inside the post bar.