This says more about the software manufacturer than about spyware or
viruses.  AV companies tend to name things.  Now that AV companies are
starting to detect spyware, they name those as well.  AV companies have more
of a reason to name things, because they are more often commercial companies
that support customers and work with other vendors.  Also, AV companies are
generally older and have more mature processes for naming and handling
malware.

That's a great idea.  Companies that don't do this may be greedy, or they
are having technical problems expanding their AV product to also scan for
viruses, or maybe they feel it's better for them to sell their products as
separate modules so you can pick and choose.

Whether they have one program or not is somewhat academic.  Most such
programs aren't really one program but a collection of multiple different
services.  Most companies, including Symantec Norton, bundle multiple
programs together for people who prefer that.

What did you pay for Spybot or Ad-aware?