The Oracle SQL relational database and some related products are proprietary,
-high cost, products that are very powerful, popular in many contexts, and
-are naturally not open-source.
+high cost, products that are very powerful, popular in many contexts - and
+are, naturally - not open-source.
and other users (who tend to prefer to use such open-source SQL databases as
SQLite, PostgreSQL and MySQL, or even non-SQL databases or a plain
file-system-based store), but it is still widely used, deployed, and has many
-contexts where it one of the only sane choices.
+contexts where it one of the only sane choices.
pay for it. I'm also not on the opinion that non-FOSS software is necessarily
immoral, or that companies should be forced to make their software open-source,
and Oracle has been pretty fair in licensing its database (as all of its
-versions are available for a gratis download online, with only some
-restrictions for deployment).
+versions are available for a gratis download online, only with some
+natural legal restrictions for deployment).