Like you, they look like cages to me. Like something that would keep you trapped inside with the fire, rather than letting you out into safety.
I'm surprised that, since snowbirds seem to favour them, they don't actually attract burglars. I have a friend who lives in an area that has lots of summer houses. She says it's the houses with gates across the driveway that are often targeted for burglary because those gates are an indicator that a burglary won't be discovered for days, weeks, even months.
I've said that many times, too. It's like painting a bulls eye on your home. Yet people do it/get a sense of security from the bars and driveway gates. Most snow birders probably have alarms, too.
I have one neighbor who is unduly proud of their caged front patio. It looks like a zoo enclosure. They also have window bars. The funny part is I was at another neighbor's home one evening with these 'cage' people and a bunch of LE/judges. Someone was talking about shopping for a home in Tucson and stated "I refuse to even look in an area with bars". "Cage" owner's response (he's also retired LE) was that he was armed to the hilt. HUH?!? Maybe there's some unspoken belief that bars = weapons that I'm not aware of.