For Housefed.com, there are 634 users. I'm a small site and all of my competitors know that so what's the big deal? Some people seem to think there is a competitive advantage to keeping that information private - but it just seems funny to me.
IMO it depends on the site and whether or not the number of users correlate directly with income. For instance, i've worked on a few microsites for brands that report number of users on the site as a form of social proof.<p>On the other hand large services that announce their numbers might persuade more companies to enter the space.
Ask yourself why and why not you should or shouldn't publish the numbers, make a list, weigh the pros and cons and then decide. Sounds like you're just publishing this info because you have it, not for a good reason.