"One mans food is another mans poison invasive"
There are more than one variety of these, the one that was (possibly still is) a problem in Florida is the East African one (Lissachatina fulica). Apparently a nasty piece of work that can destroy your crop and potentially infect you with some nasty stuff. Well cooked though, fried and peppered, it is a delicacy.
I am more familiar with the West African variety, Archachatina marginata, which you will find in every market in Cameroon, Nigeria and Ghana and is very popular with the locals. I assume it is also an invasive here and does not belong.
It is interesting how escaped pets go from someone's indulgence to everyone's problem.
Makes one wonder, all the seeds we are enthusiastically acquiring from all over the world, will one escape and become the next Brazilian pepper? I just learned a couple of days ago that Suriname Cherry is already considered an invasive in South Florida.