| Issue | Core reason? |
| High post count | No, by itself |
| Low merit | No, by itself |
| Gambling posts | No, not inherently |
| Having many posts | No, not inherently |
| Poor English | No, not the main criterion |
| Posts deleted by moderators | Yes, considered as evidence |
| Generic/repetitive replies | Yes |
| Shallow engagement | Yes |
| Forced conversations | Yes |
| Posting primarily to satisfy a campaign | Yes |
| Burst posting | Yes, under the general criteria |
| Account-farming investigation | Not established as the reason for this particular ban |
High post counts, having many posts, generic / repetitive posts, burst posting, posts deleted by moderators, posting primarily to satisfy a campaign, shallow engagement, forced conversations: all of them can be considered as factors that cause spam and low post quality.
You have limited time so if you force yourself to post more than what you're comfortable with, you turn to spam, and it is very natural change of your posting style and post quality.
Keep it simple. Forum rules say about it too.
Unofficial list of (official) Bitcointalk.org rules, guidelines, FAQ."Account-farming investigation": investigations are only investigations, nobody is guilty after a conclusion but if users are from farm, as said with reasons above, they force themselves to post more and make their post quality declines considerably.
Two big factors for considerations are plagiarism and AI. No genuine members use AI to post for post quota, post for merit, so if they do that, it's like very red flag of likely spammers.
AI guidelines.Posting in campaigns guideline.