This and your previous question raise issues that some users
(myself included) are concerned at some point. The homework questions are
among the common generators of those concerns. For sometime I really thought that homework questions must simply be deleted, as time passes, I understood that there is really no need to delete them. They have success because there are people who ask them and people who answer them. And since S.O. is a Q&A website, it should really not be a concern. Minded people simply ignore them, non mined people consider them. For your previous question, Cody Gray gave an answer that I have nothing to add. However, I will add some development about low reputation flagging.
First, it clearly seems that adding a warning is a no go as suggested by the appreciation in comments.
Now, when you look at the number of members of S.O as of September 12, 2016 you see 6,016,276 (more than 6 million). That is the number of S.O. subscribers. When you look at the number of members with 200+ reps, you see 312,891 (three hundred thounsand), that is about 5% of the total number of members. That is also about the number of people that make S.O. what it is.
When you consider all of that, you can ask yourself, shall S.O. let the 5% that make S.O. what it is decide what it shall be? or shall S.O. extend it to whoever subscribes?
When I consider how easy it is to get reputations on S.O, I am actually tempted to suggest to raise the number of reputation to get access to some tools like flagging to close. However, I will not suggest it because I think there was a clear reason behind the number.
If a member is not able to ask few good question, how will S.O. know that he/she is able to recognize good or bad questions/answers? If a member is not able to give few good answers, how will S.O. know that he/she is able to recognize good or bad questions/answers? Those are possibly the only metrics that S.O. has to judge the quality of a member.
As I already stressed, there is already 300+ thousand dedicated people out
there who will do the job before you notice it.
When you consider all of that, you understand that S.O. is certainly not perfect, however, S.O. is among the best in his category.
And when you also look at the trend out there, S.O. is now a recruiting tool. It means that some recruiters are recruiting based on credibility on S.O.? People being lazy by nature, they try to play the system to sound credible on S.O. and nail their interview.
Shall S.O. lower the standard of becoming credible on S.O. Given that people are already playing the system, I think that any flexibility in rules shall carefully be analyzed before moving forward. That is the role of some people on S.O. and I think that they are doing their best. For the special case of this flagging issue, I think it is best not lowering the number of reputation required.
However, if it is easy, I recommend S.O. to not give the possibility to low reputations to flag.
That was my 2 cents, not really an answer to the question, but too long to be a comment