Only buying ads will be charged fee. Sell ads will not be charged any fee according to what I saw on the table.
Those that are not posting ads but just want to buy and sell will not be changed any fee. But those that have the buying ads may let the price of dollar to slightly be higher just because of this so that the 0.275 to $0.3% fee will not affect them but affect people that wants to buy coins using naira on the P2P is what I think. So, those that did not post ads but just want to buy may indirectly be affected.
I always thought that those buyers who puts Ads pay some certain amount of fee, so it has been free all this while. Bybit is an exchange that is regularly used for p2p so the company should have put up these few before now. Buyers who has such ads make not quickly accept this or see it as unfair but in the bigger picture even to get a blue tick on any social media now you pay a fee, so nothing is free .