According to the free software definition [1], it's one of the essential freedoms:
>The freedom to study how the program works, and change it so it does your computing as you wish. Access to the source code is a precondition for this.
Absolutely not. Anything less than the 4 freedoms is unacceptable. If the program is discovered to be spying on its users and users are not allowed to modify and redistribute the source code then there is no way to fix the problem.
According to the free software definition [1], it's one of the essential freedoms:
>The freedom to study how the program works, and change it so it does your computing as you wish. Access to the source code is a precondition for this.
[1] https://www.gnu.org/philosophy/free-sw