(Some spoilers ahead)
The plot of the movie Arrival (2016) is that aliens come to bring peace among humans and ask for a favor to be given back in the future. This is possible. But what if this is not the only interpretation?
One of the key developments of the film is that an interpreter of languages is challenged to understand the way the aliens communicate, via visual signage, logograms: pictures that represent a group of ideas and words simultaneously, hence giving the "speaker" the ability to see reality beyond the present time, and so, foreseeing the future.
This skill can be called many ways. In the movie it is called tool, gift, and also even misinterpreted as "weapon" by the Chinese who have interacted with the aliens through the analogy of games, in which winners and losers could be assumed on each side of the game. Some characters in the movie understand, under certain logograms, that the aliens are saying "use weapon", and others understand "accept gift".
"Use weapon" seams to place the idea that this is the reason why the aliens are in Earth. How this is interpreted varied across different countries and characters through the movie as well as audience. The trick part here is that "use anything" sounds as the aliens are coming to help. Here is where one could see a problem of interpretation of the aliens intentions.
One could easily ask: what would happen if they had not arrived? Perhaps nothing. Perhaps human extinction. It does not matter. What matters in the context of the movie is:
Are humans free to accept the gift?
Or may it be "an offer not to be refused"?
Is there any hint of in which way the humans should help the heptapods in the future? And would this be simply a token of appreciation or mandatory?
Of course the movie hints to a positive understanding. Just seems a fun question to ask.
Another note on the other section of the aliens main proposal: "use weapon" has two parts, and the first one is "use". This could be understood as "accept offer" as well as "receive gift" but at the same time it could appear mandatory such as "do as commanded": an interplanetary and through time and space mob. Not quite likely to be honest, but still a possibility.