Same could be said about all the young and hopeful people that show up in L.A.... Self taught or professionally trained they show up to casting calls/interviews and demonstrate their work. Sometimes self taught actors get a good gig and join SGA and continue in their career. SGA does not assure anyone success it's just there to make sure actors don't get abused in the process.
Imagine how many people have gone to Silicon Valley and worked their butts off in a startup that really went nowhere. It would be nice if they had a union that had resources to indicate if the developer should quit, go to another startup, or take another position. An intermediary that could assist with some analysis of the cap/gap tables would be helpful. A union that could indicate the daily minimum pay with a startup would be nice.
If you want to tinker with code no one would stop you. But if you got a gig and tinker with code after 3 paychecks you could join a union. Many actors don't join SGA when they start. They take on multiple gigs and then decide if the fee is worth it. Plenty of youtube videos go over the options. It seems very flexible. I don't understand why there is resistance to the idea. It's not some factory union. A Software dev guild similar to SGA seems most appropriate. Essentially most dev roles are contract roles for a short amount of time 3 months - 3 years.
Imagine if we got residuals from our code... Best incentive to document, unittest, and push some code library.