LOL'ing at people saying that one's person's observations are not "data" because if it comes from a single person it's an anecdote.
That's not how empiricism works, people. In a scientific journal what makes something an anecdote or a data point is methodology, not the number of principal investigators on the grant application. Same here.
Now you may not trust that someone on the internet you don't know is actually following the methodology that they say that they're following, but that's a different issue altogether.
In short: if you're saying that it's not data if only one person collects the observations, you're just wrong.