Borland was going broke because they abandoned their core target market for chasing after the enterprise - and that was during a time before open source even got its name and developers expecting tools for free was a thing.
And have you seen the reputation these systems you mention have among developers (assuming they know about them, after all my original point was that the "enterprise pockets" requirements lead to obscurity - with the obvious exception of those that have been around for a very long time) and how clunky they are? Turbo Pascal and early Delphi never had the reputation that Oracle has nowadays.
And sure, you can find works with them but these systems are a minority and when they are used they are practically never chosen by developers themselves.
The reputation among FOSS devs sure.
I have been working in enterprise world since 1999, where most folks don't even know that HN exists.
They don't even think twice about buying something like Oracle.
I'm not sure i follow, you mean that only FOSS devs dislike stuff like Oracle's?
There aren't "toy" versions of Cisco, Oracle, DB2, SQL Server OLAP, Sitecore, AEM, LifeRay, WebSphere, SAP, Hybris, PTC, Aicas, Ricoh JVM, Gemalto M2M, ....
And yet there are plenty of projects available to work on with those stacks, including green field projects in companies adopting them.