There are many databases build on the beam/erlang. To the mentioned I’d add antidote db and barrel db – there are probably quite a few more. Both are quite interesting, but certainly not as popular as e.g. couchdb or riak. So the BEAM is full of options in that space. What you feel to be a favor for sql (postgres) is more the fact that databases are very complex systems, which need time to be developed and some hard questions to be answered competently. Therefore people are even more likely to stick to proven tech which they know and especially which they know works e.g. compared to a runtime programming language. Postgres seems to work for a lot of people/use cases, and the adoption does get even bigger for sql based databases, so including mysql, mssql, ….
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