As others mentioned above, first and foremost there are legal matters to consider. Not even only for the archiver, but also sometimes for the dev themself, who could have a very good reason of why they only publish their game a certain way, or - because of that - how they can handle future sharing and archiving.
From an archiver's point of view: You can not >just< take another person's game and upload it without considering (and knowing) that legal situation. I think it was mentioned in another topic a while back, but there is no law for video games the same way as for some music and literature that has been made public-domain, and even there sometimes the situation is not that clear-cut nowadays.
With all that being said: I am also on the side of game preservation. As soon as you publish your work to the outer world, it starts connecting with it. That is partially why you wanted to create it, right? It can resonate with people - a lot even. It would be entitled of those people to say they have a right on it, yes. But it also seems short-sighted to take it away for them without reason. Or to not think about avoiding such an outcome.
Which brings me to how I would (generally) handle this situation: Try to plan a way you will handle this for future preservation. You have terms of use for your game, you want to keep it in your hands as long as possible and only the way you want it to be available. That is fine. But think about how you will open this up for a scenario x (or think about it when scenario x comes) and change your terms or add an addendum. Give your work (partially) into the hands of others, so that they can at least keep it online and alive.
At the end, it will always be the responsibility of the game dev, and they also will always have the last word. Which makes sense and I believe this should not be changed (unless something like public-domain would make sense). But they should also bear the responsibility to think further ahead about their work and what it means to the world. It would actually annoy me quite a lot to know I would have spend so much effort into my work just to see it gone one day because I did not set up a proper way to allow people keeping it around.
As others wrote: You should try to get a broader picture of the situation and ask both sides. I support you for opening this topic first - and making a video out of it can be informative and inspiring.