I think the biggest problem is that much is said to be fact-check but is, indeed, opinion verification. People have many degrees in how they express themselves

I think the biggest problem is that much is said to be fact-check but is, indeed, opinion verification. People have many degrees in how they express themselves and many times an opinion use words that resemble factual statements. Then others read it as facts and want that someone give a validation or rebuttal of it. Add some partial fact-check, some political inclined, some strong words, and then everybody has opinion of the credibility of it. Be it centralized or distributed.