They came along in the late 1970's and early 1980's ... I remember them then ... they died out.... it's not a new idea. But ... I think, once you have found a piece of fingernail or a long human hair in your free range, unpackaged, scooped out of the bin into your own plastic bag, sold loose, cornflakes ... it rather puts you off ! They died out before, they were a marketing gimic then and they are a marketing gimic now, they will fail again.
I'm not a germophobe .. I grew up in the back streets of South Yorkshire in the 1950's - we lived with playing in the dirt, with a bath once a week whether we needed it or not ...we still had polio, diptheria, scarlet fever, measels ... all of which caused deaths on occasions. We were lucky, we had our own outside toilet and a hot water gas geyser for a hot bath in a bathroom (albeit the toilet was outside !) many of my friends shared an outside toilet with several neighbours, the bath was a tin one on the back wall of the house and the water was a cold tap in the kitchen, with a bit of luck, for some a communal hand pump serving the square of terraced houses.
We've learnt about germs since then ... we know how they spread and how easily they spread - the world has just suffered the biggest pandemic since the flue scourge of 1918 ...we have all learned more.
There is probably only minimal risk in re-using jars returned to you, there is probably little risk from punters filling their own jars from a tank full of honey ... do I want to take the risk of someone with a disease passing it on whilst using a honey gate ? No, I don't.
I lived through a childhood where hygiene was still not fully understood ... where campaigns to catch your germs in a handkerchief and to wash your hands after using the toilet were necessary to educate a public that were, in many cases, ignorant of the ways germs spread. I still see well educated and presumably intelligent people who still seem to be ignorant of basic personal hygiene, do I want to risk my health in my old age by returning to the days when all food was sold loose ? Not at all.
I can't see the need for honey to be sold loose ... or sold in second hand jars. There are better ways to save the planet.