I actually came to write that the big takeaway for me was to care about things that actually exist. Pouring your life into a fan site that can one day disappear seems incredibly depressing. In that time others have built companies, relationships and a happy life and you have built: a collection of fan art for an obscure tv show.
Wow. Not only is this totally insensitive, and completely fucking rude.. it's also widely naive.
He obviously built value for a lot of people. In addition I'm sure developed some very portable skills. Helping to curate a site that brings that many people joy? We should all be so lucky.
The idea that the rug could be pulled out is indeed a significant lesson, but it's frankly one that both sides of the coin need to learn. Platform sites that encourage users to invest in and create content for will suffer if that content isn't taken good care of, in the long haul.
It seems harsh to judge somebody like that. It is, after all, a hobby, and it's not like it keeps him from doing other things (like having a relationship) as well.
Besides: your company? It'll probably fail before having more than a couple thousand customers. This page? It certainly had more people interested than that!
So it's not just a viable hobby, but one at which the author was relatively successful.
Accepting that everything has an end and nothing can't be taken away from you is fine, but this doesn't mean you should not focus more on things that can't be taken away from you easily (i.e. until you die).
Isn't there something better one could be doing?