Hate isn't for bounty hunters, hate is for spammer like you. I review your post history, only that post you made little bit longer. Others all are within 10/12 wrods and bounty reports. And as far as I know this is your first post on meta.
1. No shitposting Until 30 posts.
2. No shitposting after becoming jr. member while participating in ICO since there is a restriction about symbols used and constructiveness.
Not agree.
No shitpost forever is better option. I can't realized why you quoting all the post. Avoid quite full reply if unnecessary.
Bounty hunters not a problem for forum, spamming is main issue. But unfortunately most of bounty hunters is spammers due to signature campaign.
3. What else can we do against shitposting and spamming (or do we need to do anything at all?).
Use report to moderator option if you found spamming.
4. What do you think about the decision of the administrator?
Positive. It's not only admin dicision, suggestion came out from well reputed forum members. You can call them forum assists.