ao3 is free. it has no ads, no vip tiers, no paid access. you just open it on your phone, your computer, whatever you use, and you can read thousands of stories without paying anything. that is the whole point of ao3. please stop trying to change that and just leave ao3 as it is.
'AO3 needs an app and ads!' No, it will be subject to the platforms ToS or sponsor demands aka censorship.
'AO3 needs an algorithm!' No, it's not a soc med platform, it's an archiving site.
'AO3 needs to monetize authors!' No, OTW will be sued into oblivion.