I don't think it is a straight scam. Maybe you work for nothing, that's all, but at least it doesn't seem that you will send any money and lose it. But hey! for some people time is more valuable than money itself, and it is a scarce resource indeed, so be careful.
What surprised me is the following:
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To be honest,i'm afraid to create a topic,because now,under the new rules,the merits of the account can be removed

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Is it true that, under the new rules, the merits can be removed? If that's the way it works now, this is the first news I read about it...
Now, that's obviously a scam. There's no way your merits will be removed, but if your posts are not that high quality and useful, you won't grow your merits earned.
For someone who is still new in the forum, one will definitely bite this message. To be honest, there's no wrong in the message but it only gets clearer that it's a scam seeing at the last part of the message. So if you are not knowledgeable about how everything goes in the forum, you will definitely fall into this kind of scam. Better not to click or post a reply then.