Correct me if I'm wrong but that only pertains to RMT. From the article Square released when they prohibited the advertisement of boosts --
It is not a violation to ask for help or to offer a reward when asking for help, as in the following examples that do not violate our policy. However, in the examples that do violate the policy, the person offering help is advertising their services, which is prohibited.
Examples of violations:
- Selling [duty] clear for 1 million gil.
- Selling [duty] clear and/or offering the associated rewards from [content]. Join for more info/details.
Examples of non-violation:
- I'm new, can anyone help me clear [duty]?
- Help me clear [duty] and I'll pay you 1 million gil!
- I'd like to get some items from [duty]. will pay 1 million gil if I can get it.
If I'm misunderstanding something, please let me know.