Since when? Mongo was popular because it gave the false perception it was insanely fast until people found out it was only fast if you didn't care about your data, and the moment you ensure write happened it ended up being slower than an RDB....
This was typical crap you had to say to pass fang style interview "oh of course I'd use mongo because this use case doesn't have relations and because it's easy to scale", while you know postgres will give you way less problems and allow you to make charts and analytics in 30m when finance comes around.
I made the mistake of picking mongo for my own startup, because of propaganda coming from interviewing materials and I regretted it for the entire duration of the company.
Distributing PostgreSQL still requires proprietary extensions.
With the most popular being Citus which is owned by Microsoft and so questions should definitely remain about how long they support that instead of pushing users to Azure.
People like to bash MongoDB but at least they have a built-in, supported and usable HA/Clustering solution. It's ridiculous to not have this in 2024.
Current preference: 1. HA MongoDB 2. HA MariaDB (Galera) or MySQL Cluster 3. Postgres Rube Goldberg Machine HA with Patroni 4. No HA Postgres