The Spaghetti Westerns — streaming options? 4K?

When I look up any of the Dollars movies it looks like they are available to purchase in HD on your usual: Amazon, Apple TV, Vudu & YouTube.

What releases are available on the streaming platforms? — There doesn’t seem to be any way to tell which release this is on any of these platforms? In 2021 many of the Dollars Trilogy movies were redone and released in 4K/UHD disc. I know the 2017 and 2008 Blu-ray Disc releases had major issues regarding the color compression and audio track being very different from the original, and that many of these complaints where fixed in the 2021 4K release. I do not think the options available on any of these marketplaces are 4K.
Where do you buy your movies? — which streaming platform has the highest bit-rate and generally the greatest selection in 4K?: MA, Apple/iTunes, Amazon, Vudu, YT
4K, when? — When will we be able to stream these legendary movies in 4K on some of these platforms? Who decides what gets put up in 4K?

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