They're supposedly under 500 employees, which is the EU threshold for small and medium enterprise. They prominently mention their small business status in their post. It's likely that their assertion is deliberate.
If Reddit didn't exist and their traffic was driven to niche forums/websites then you could expect hundreds of thousands of jobs.
And I don't think it's great that you have one site controlled by an evil company and filled with low quality content/discussion about every niche topic when you could instead visit 2-10 websites about the niche content you care about.