EnterpriseDB - what happens to pgsql?

Just wondering what the general concencus is about enterpriseDB from the
pgsql community? good or bad?
I'm not 100% up to speed, with opensource development - but they seem to
have a policy to contribute improvements
back to pgsql. This sounds (to me) like a good thing for the pgsql
development, and a good opensource philosophy but:

Is there a danger that users new to databases, will skip pgsql
alltogether and use edb's free version
or have i missed something obvious here?
again, appolligies if i'm showing a lack of knowledge about opensource here?