The main thing about the dark glass bottle is that UV damages olive oil making it taste worse. If your olive oil is in a container that lets in UV you're guaranteed that the manufacturer doesn't give half a hoot about quality.
I'm a bit skeptical of claims like this. All standard transparent soda lime glass is opaque to short wavelength UV (UV-B and UV-C) but is in fact trasparent to long wavelength UV (UV-A) (transmission drops off rapidly under 350nm). However, what tinting is actually being employed in any particular bottle and how effective is it at blocking long wavelength UV? To be sure, there are some tinted glasses that are effective at blocking long wavelength UV, but can the consumer identify those by sight? Amber glass is meant to be pretty good at blocking UV, presumably UV-A since regular glass will block UV-B and UV-C, but amber glass seems to be a fairly complex formation and it's not clear to me if some formulations are more or less effective than others. Beer sold in clear glass is relatively rare, but green glass isn't particularly uncommon and from what I can tell ferric ion green glass doesn't seem to block UV-A any better than clear glass. Green glass made with didymium is often used as UV filters, but I don't think that's used in beer bottles.
I suspect tinted glass has more to do with marketing, consumer expectations (and maybe cargo cults) than UV protection.
(Also, what brand is in the habit of leaving their bottles of EVO sitting out in sunlight instead of in warehouses, in shipping containers, in stores, etc? When you avoid direct sunlight and electric arcs, the UV threat should be minimal.)
I suspect tinted glass has more to do with marketing, consumer expectations (and maybe cargo cults) than UV protection.
(Also, what brand is in the habit of leaving their bottles of EVO sitting out in sunlight instead of in warehouses, in shipping containers, in stores, etc? When you avoid direct sunlight and electric arcs, the UV threat should be minimal.)