On the other side of the pond Big Clive loves ozone generators.
For cupboard and fridge and similar use, yes. They kill mold (something that is a constant problem at Isle of Man, where Big Clive lives, due to the climate) and bacteria. They also only put out trace amounts ("microscopic amounts" as Big Clive says) of ozone in the air, unlike room deodorizes, what we're talking about here.
Big Clive on ozone:
Big Clive on a room ozone deodorizer:
Ozone is one of those gases that you do want in air in trace amounts, but not too much. And the amounts Big Clive recommends are absolutely minimal, not enough to cover any indoor smoking. The room deodorizers, on the other hand, use large amounts of ozone to have an effect; and it is these large amounts that are detrimental, not the trace amounts.
A proper analogy here would be using a tealight, or an open flame. One is pretty safe emissions-wise, the other is extremely dangerous in closed spaces due to carbon dioxide, particle emissions, and possibly carbon monoxide produced.