Other companies take ideas, consider them long and hard - and usually follow other orgs doing something similar who have already proven something works. They do a lot of planning and tend to put much more funding in up-front.

Both approaches suit different businesses. The former being startups and SME's, the latter where market share is already won and now they just acquire other businesses that develop the former way.

If we're considering what people develop at home however.. 99.9% of the stuff I write is never publicly visible, and it's terrible because I'm not a great developer. But I'm not a regular open-source contributor. I issue the occasional patch for shit that's broken for me.