Why wouldn't they be? Check the accolades, matches, moments and merchandise sales and I don't see how you can have much of a gripe against it. No chance they're outside the top 5, at least.
That being said, it's a WWE list so like Chris said: it's all some arbitrary political agenda-pushing nonsense. Which is the only valid explanation for FTR not being pretty high up on the list because they should surely be in the top half based on some of the names we're looking at here.
And I will also say I personally wouldn't have given so much credence to the "dream teams" like BOD (name one great tag match they had) and The Mega Powers (had 3 matches together in WWE). Those teams may be iconic but it's only due to who's involved, not anything to do with their actual output. When it comes to these types of teams, I'm taking JeriShow and Rated RKO over those other two any day of the week. And if you put The Mega Powers THAT high, then surely The Two Man Power Trip should at least make the top 50.
I know it's implied that this list shouldn't be taken seriously but let me just say that I cannot take this list seriously.
. No shots at wwe allowed!