Beside, why fiverr hold these requests and manually accept them (or at least I think so)? If there is someone monitoring these requests, then why there are some sellers offer their services in that section?
I don’t white understand why either. Posting a request I think said it’s checked but maybe what is doing the checking is mostly a program (maybe Fiverr staff has a brief look at the requests sometimes but maybe there’s so many and they don’t have enough staff to look thoroughly at each request. Maybe having them in batches allows them to quickly scan all the requests about to be sent to the viewable buyer request page).
Perhaps the wait for the next batch of requests to appear is for caching/speed issues (if they were each checked by a program and made viewable to all sellers as soon as they were posted, perhaps it would slow the system down too much. It also wouldn’t give the poster a chance to delete the request if they made a mistake/wanted to amend it (though there should really be a preview option before the request actually gets posted), and perhaps the program(s)/functions that sets them so they are viewable by sellers are and does the checking are set to run at particular intervals.