In my experience it's a million times easier to stand up a free tier MongoDB through their atlas service. If you need a local instance, I believe two or three commands is all it takes and you have it up and running locally and only accepting connections from the local host.
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Security-wise, MongoDB is a worse choice. What would be the very advantage for your use case why people suggested it as a better solution to you?
Their main reason was that they prefer the syntax but my own research suggested that it was faster and easier to find online hosting for.
Interesting - I know many MySQL (and some PostgreSQL) hosters, but only one which provides any NoSQL services. I might check that some time.
In my experience it's a million times easier to stand up a free tier MongoDB through their atlas service. If you need a local instance, I believe two or three commands is all it takes and you have it up and running locally and only accepting connections from the local host.