Almost certainly no, but it should be.

No. Almost all software will not be published - it’ll be one offs for specific purposes, summoned on demand and likewise discarded when no longer needed. This follows from software becoming 10-1000x cheaper depending on its boilerplate content.

Yes, in that it will be generated from open-source code whose license it will ignore; No, in that this stolen source will not be available.

No.

Open source is generally limited to software that a developer finds to be "fun". This is mostly software related to computer operations and networking.

Maintenance and support are not much fun so open source generally avoids offering any without payment of some sort.

Lots of business software and/or services are not much "fun" so open source typically avoids these too. A good example is US payroll.

Basically, any software that requires "non-computer" knowledge or experience is likely to receive very little open source attention and I don't see this changing any time soon.