Something to consider is a monolith can have different entry points and a focused area of work. Like my web application monolith can also have email workers, and background job processers all with different container specs and scaling but share a code base.
And coming from a background where I work heavily with Postgres a bunch of smaller segregates databases sound like a nightmare data integerity wise. Although I’m sure it can be done cleanly there are big advantages with having all your tables in one database.
It won’t get paywalled. Instead they will let it get useful then start injecting ads into it once people trust it.