Nobody disputes that comment engagement is good. And in fact my concern isn't even about the rewards themselves, but about the negative side effects of having a lot more spam. That's bad for (sincere) engagement in a lot of ways. I'm sure we've all seen comment sections and such on the internet which have been heavily polluted with spam, or tried to use email services which don't filter spam well, etc. None of these are enjoyable or sometimes even functional at all. They also don't have the additional challenges of a blockchain with finite shared resource capacity.

So I'm really not sure what is the best solution. I'm not even proposing that the curve not be removed, I'm simply raising an additional concern to be considered, and I'm reasonably sure that it a valid concern in terms of the bad side effects I mentioned (again, primarily not the rewards themselves, but rather the potentially large damage caused by spammers chasing those rewards, even if the rewards are very small)