Actually, I think iOS is much "better" designed, at least in the sandboxing and lack of user (confused/tricked or otherwise) access. The App Store verification method, though still not perfect, doesn't even
exist in most other OSes.
Software takes up no
physical space until it is put on some kind of media. A
billion copies takes only as much disk space as
one copy. It is extremely easy to "warehouse".
Just because software (or fill in that word with hundreds of other items) is still available, doesn't mean it useful, safe, needed, supported, or even good. People actually still get SCAM letters via snail mail. People still respond, but the SCAMs are
still fraudulent, and the "recipients" still lose money.
Norton was a package of disaster many years ago, well known for causing many more troubles than it ever prevented. I haven't seen a favorable review of it in a decade. But, I'm actually holding back on what I really think of it (and most other third-party "security" software).