MongoDB open source for large-scale apps

Hi there, I would like to know if MongoDB open-source version can handle large-scale apps where there are hundreds of thousands of reads and writes. Currently, we are using PostgreSQL as our database but we are looking for a document-oriented database so, we are considering MongoDB.
Lately, we faced some issues that couldn’t be solved in our backend because of a huge increase in users so we are rewriting our backend with different technologies and MongoDB is among them, however, we only considering the open-source version of MongoDB because we have a lot of users up to 150K active user regularly read and write mostly read and we can’t afford the enterprise version.
In two years we are planning to launch a paid service and then we will be able to afford the enterprise version but for now, we want to stick with the open source version, so my question is:
Can MongoDB open-source version handle 150K active users? Our main concern is performance and latency.