It appears that the irony of saying "Those assholes are wrong to only give out counters to non-adult websites! I hate when people try to impose their beliefs on others!" is completely lost on you.
People who run those free counters are not on some kind of moral crusade. Here's how most of those things work. The free counter that people stick on their site links back to the counter's website. As more people add those counters, those links number in the thousands. Search engines (especially Google) see that and think "Wow! That must be a really important site if so many people link to it!"
Now that counter site is considered to be an important page. Consequently, any pages that it links to are considered to be important as well, which means they get more prominent positions in search rankings. Companies are willing to pay dearly for this, since that means more people will find their website. So they buy links from those counter companies. And that's how they make money off "free" counters.
It just so happens that the company has likely decided that the possibility of scaring off potential advertisers by having their website associated with a deluge of porn site links is worse than the added gain by those additional links, so they decide not to accept them. It's not some kind of moral thing, it's just a business looking out for their interests and trying to mazimize their profits, as any good business should.
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