I also know that, there are others who have similar privacy enhancing kyc procedure as p2p exchange, but i decided to mentioned only remitano, but you all are free to add your best privacy enhance p2p exchange in Nigeria, at least for a forum newbies, since what you require to exchange your naira to dollar's is just an email/phone verifications for level1 accounts,it sound privacy enhancing enough for p2p to be recommended for forum newbies not to expose entities all in the name of trying to carry out p2p transactions.
Just to add some few things to what you have already said; KYC level 1 users on Remitano can not create ads they're only allowed to trade at 1% charge. Yellow card is another easy-to-use interface and Naira account supported p2p recommended for newbies
Small transactions: Remitano and Yellow card are recommended.
Big transactions: Bybit zero fees is better.
About the $33, I think you means 0.0005 BTC as the minimum deposit on Remitano. I think I have see some people complained about it before. Also on OKX which is not available for Nigerians again.
Their exchange, their Rules - just the same way they have a static BTC gas fees at $30+ . The minium deposit of BTC was increased to $40 recently.