| Does a lawyer do law outside of billable hours? Some do pro-bono. But not the majority. Does a doctor practice medicine outside of his hours? Again, some work at free clinics, but generally no. Do veterinarians like it when you ask them to take a look at your cat when they're not in clinic? No. Almost always no. Work is work, leisure is leisure. If coding is leisure for you, that's great. |
Yes, all of them study law outside of work clients pay them to do; in fact, they are required to do so as a condition of licensing, it's called continuing education requirement.
The same is true of virtually all licensed professionals.
Programmers aren't licensed professionals, so they don't have a licensing requirement for continuing education. But the programmers that are professionals, even if not licensed are doing continuing education anyway, and hands-on projects that aren't for paying clients is frequently a big part of that.
(Now, professionals with good employers will often be paid to do continuing education on work time, and that's true of programmers, too. If you have 20% time, your continuing education projects may not be “side projects”.)