Regarding the Nether, we did have a big discussion prior to 1.16, and settled on resetting the nether past 3k blocks, since that would allow everything based in the current overworld/nether pairing to be left as is, making it so players' hard work isn't reset.
There's definitely not going to be a shortage of quartz any time soon, past 3k blocks in all directions, though we did discuss regenerating the Nether like we do the End, past 4k blocks in the nether, to allow for farming of Bastions and such.
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Regarding a shop that gives away items for free - I don't believe this kind of thing has a place in Zen market, and would be taking away space for players who actually want to use it for it's intended purpose.
There is also a doubt that a free shop could maintain stock, which is part of the
regulations of Zen market.
We have an area for giving away free items in the farm tower, if you'd like to put items in those community chests.
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I don't think I'll make this meeting, but I hope everything goes smoothly.