Much like fuel going bad, I would guess that the use & enviroment has a lot to do with weather the rims rust or not.
Down here I am yet to pull a tyre full of any tyre sealant and find the rim clean and rust free enough to replace the tyre without first cleaning and repainting the rim.
Regularly the rust around the valve hole is so bad I either drill a new one & plug the old or replace the rim.
I feel sure it is the tyre goo because when I get a mower in for new tyres , if one has goo in it and the other has no goo, the no goo rim is always sound and the goo rim is always rusty.
By the time a tyre is suffering from dry rot it's structural integrity is compromised as the plasticizers in the rubber have been oxadized or broken down by UV rays.
So it is time to replace them.
Or in the case of real tractor tyres, fit a tube.
You prevent dry rot by using tyre dressing from the time that the tyre is nice, new & soft.
I do have a 5 gal pail of Stens tyre seal and I do use it when requested to by the customer.
Like a lot of things, I warm them once that it can rust the rimes and means that the tyre can never be plugged if the get a big hole in it.
If they still want it in the then it is $ 20 / wheel thank you.
More than once I have needed to replace the entire tyre because the owner got a big thorn hole in it and with the goo inside, I can not plug it.
They take the wheel to an "unbiased tyre shop" pay $ 20 each for several plugs then go to my competitior for a new tyre cause they are too embarassed to get one from me.
Perhaps the lattest goo is better than what I have been using but the green ( slime ) purple, Blue ( Stens ) Pink & yellow stuff I find in tyres is always associated with badly rusted rims.
The fact that the labels make the effort to state it will not rust the rim or helps to prevent rim rust or whatever tends to support that rim rusting was a problem in the past at least
The closed cell foams like fix-a-flat do not rust rims in themselves but on spoked rims they hold water that wicks up through the nipple hole.
AFAIC if those rims rust out it is the owners fault cause the stuff is only supposed to be used top get you out of trouble and not a final repair.