What Makes a Cartoon Forgotten?

I make a list of my favourite cartoons and place something like Sazae-san or Dragon Ball on the list. Somebody will tell me that the show does not belong on the list because it is an "anime" and not a cartoon.

Similarly, I make a list of cartoons that have been "forgotten" and place something like Total Drama on the list. This would just be confusing for so many people since that franchise has a fan base of millions of people yet has been called both underrated and overrated and is not really mentioned in conversations about animation today. (This may have been a bad example, but I am really confused about its reception at all.)

My point is that people can label any cartoon forgotten whether they are truly forgotten or merely undiscussed. (Again, I mention Oggy and the Cockroaches. You may be in the United States, but that is not an excuse to call a cartoon that you rarely hear people mention in that nation "forgotten" when it is broadcast in over 800 million households. I know that I mentioned these in my last post, but I felt that these were noteworthy antitheses to showcase.)

I like your definition, though, so the Spaghetti-O cartoon is forgotten after all (and likely lost media).

What do you think is forgotten? (Apologies for sounding redundant. I have just recently noticed some discussions about forgotten cartoons and felt bothered, as some of the cartoons seemed to have massive cult followings but were simply not mentioned anymore.)