You can still view the source code. That’s what open source is.

No, it's not. It only counts if it provides the four freedoms listed here:

• The freedom to run the program as you wish, for any purpose (freedom 0).
• The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1). Access to the source code is a precondition for this.
• The freedom to redistribute copies so you can help others (freedom 2).
• The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.

And before you say "but that's the definition of 'Free Software', not 'Open Source'," even the latter, misguided as it is, at least still requires freedom 0!