I am the founder of a company and I have told my employees my salary, so this isn't really a theoretical question I guess. So, yes. I have no problem disclosing it to those who matter. The reason behind me disclosing it was to show that I was not the highest paid person in the company per salary. I have asked my employees if they want their salaries shared, they have overwhelmingly voted against it, even when I bring up negotiation power.

This is such a culturally strong issue. I truly wonder how this should be implemented. As far as I know, its all prejudice from the public itself.

Yet everyone goes to glassdoor to check salaries.

If your coworkers know it, everybody knows it. Not only are there blabbermouths and gossips everywhere, a coworker may have an axe to grind against you and will surreptitiously leak the information.

This is possible but a risk I was willing to take. I highly doubt my employees will post it online and run a massive SEO campaign for everyone to see.