I see what you're saying now. No, I'd say all three of those fall under Martial Arts. Combat Systems and Self Defense are just marketing ploys. Wrestling, Judo, Muay Thai/Kickboxing, Jiu Jitsu are all traditional Martial Arts and extremely effective in a real-life fighting situation.
Avoiding a fight is normally the best option, but what if you have to fight to protect someone? I had to fight who was taller and heavier than I was, because he was threatening a woman with a knife. Thankfully, my training enabled me to protect myself and other people. I got away with a broken rib, three bites and both my eyes (despite the best efforts of my opponent to gouge them out).
There are techniques which are effective in competition but not so effective in a street fight.
I don't think you actually understood what I was saying. The difference is not primarily in techniques that are taught (though the difference are there obviously) but the mentality that is being ingrained into the respective students.
Martial arts like I mentioned are focusing on the spritual, philosophical side of the form they are practicing. Be calm, move like the grass, etc.. And whilst certainly an effective mindset when you are just practicing it and as a whole a healthy attitude, it simply doesn't reflect fighting.
Similarily, sports or more accurately, sportified forms, without fail, operate under a ruleset. Gauging out eyes isn't allowed, certain body areas are prohibited to attack and fights are governed by a referee and called short according to rulesets. And again, a real fight doesn't have rules. If they guy gets a hold of your eyes, he'll try to gauge them in. If he has a weapon, he will not discard it in a sense of fairplay or avoid hitting your head, groin, throat, etc. with it. Neither can you count that an attacker will be alone as students are familiar with one on one sparring or tournament fights. Actually most of the time, attackers are not alone.
And even a good couple of self defense forms are too focused on the flight rather than fight aspect. Fleeing is of course the most sensible thing to do if you are confronted with someone out for trouble. I'd rather have them laugh at me and call me a coward than end up being a dead hero all day long. But as you have said, for once there is not always the choice of fleeing. Maybe you want to protect someone, or maybe you're cornered. And here, most self defense courses no longer supply the required mentality of going for the jugular. Once your choice of fight or flight is reduced to fight, you need a certain aggressive mentality to go through with it. Half hearted attacks will in most cases not work, or at least come hand in hand with severe risks.
I do not think that self defence or combat systems are a marketing ploy in any way. Sure, some specific ones might just be, trying to cash in on unaware people because they market that extra oomph, the badass factor or whatever. But that goes for every school you can find, be it Karate, Judo , Systema or Krav Maga.