Programmers are the only[1] hired professionals that can compete directly or go off the market entirely in their own venture with either:
A) nearly zero overhead costs
B) can afford the overhead costs
The compensation is to discourage programmers from doing so, make life comfortable enough for them to not want to bother with getting around IP assignments
The major market of California barring and invalidating non compete clauses in case law, and strengthened by the legislature, also codifies this premium
Make the software alchemist’s lives comfortable
[1] feel free to find counterpoints, and what is their compensation like?