People can get things very wrong. Have a look at the bozo answers. Australian slang I get that you might never have heard it. It doesn't mean the op is wrong though.
reddit has turned in to a steaming pile of crap. or maybe it was always like that.
thankful we moved away for our special kind of banter.
A gig is a job, a kind of horse cart but I'd never heard of being a sticky beak slang term, learn something every day. I'll never quite understand why people bother to waste time being jerks online.
'Initial public offering'. Just means they're going from a private company to a public one where you can buy shares. Also means it'll probably go to (further) shit. heh.
People enjoy shitting on others to make themselves feel superior. It's gross. I have not heard of 'gig' in that context, but I didn't grow up in every single state, city, and town in Aus simultaneously. OP is just trying to the slang-etymology for that usage, doesn't mean they're wrong. Netizens can be so cuntish.
I was sufficiently moved by the confidently incorrect assertions of some of the respondents to this post to add my own contribution. Yes, I know people that use the word "gig" in this manner, and u/Positive_Complaint had to dust off her 3rd party app and add her 5c!