From my old army days we had a rule about complaints. If you bring a complaint forward, you had better have a solution. Else wise it is not worth listening to. If your solution includes self promotion, then it again isn't worth much either.
We have a very similar guideline within our company. And just in general I think these are very good words to live by, not just in a work context. Complaining is easy, it requires no effort, skill or knowledge, so you shouldn't think you deserve something (like a solution) for simply complaining.
That being said, in the context of Rail Nation, I think it's a bit different. It's very honorable and useful if you complain only if you have a solution, but that's not necessary. It's not your job or obligation to do that, especially because figuring out a solution from the outside is often not even possible. For example I could also complain that we don't have any settlements on Mars yet, but I probably don't know enough about the topic to combine that complaint with a solution that is actually useful.
So even though I fully agree with what you say, I would still say that, in the context of being a customer, simply complaining is still okay. Even if it's not always that useful, you can still voice your opinion. Just hearing your opinion is already useful, especially if you explain your opinion. Then we can try to figure out a solution. Maybe we won't be able to, depending on the problem, but it's good to at least know about the problem.
Coming back to Clash!: I don't have a solution. We can't prevent people from intentionally losing, we can't control peoples minds. We also can't just punish everyone who simply loses hard. Might be a lack of understanding, might be internet problems, might be someone afk because he needs to answer the door. We can't just ban innocent players. Of course we could catch players who have done it a lot of time; so often that it can't be a coincidence anymore....but then they already did it. That doesn't prevent anything. The same applies to announcing draconic punishment. We already announced that cheaters might get banned and we do it. They don't seem to care. Also, in general, research confirms that announcing harsh punishment doesn't stop people from commiting crimes (or rule violations in this case). Sure, we will punish them eventually, but that doesn't undo the cheating.
So, before my morning coffee gets cold, let me wrap this up: This is far from being a trivial problem; it's hard to solve. The good thing is that only a tiny percentage of players is foolish enough to cheat in Clash! and since every active player is playing a lot of matches, due to the law of big numbers, everyone is affected in the same way and it doesn't really matter on the long run. It's very frustrating in the particular match where it happens, but it won't stop your progress in general.
If anyone has a realistic solution to get rid of these frustrating Clash! matches, I'm happy to hear them. If you don't have a solution and simply want to vent or complain, that's fine too. I just ask you to consider that the reason we don't have a solution right now is not because we don't care, but because a solution is simply not that simple.