The game mechanic is incredibly simple, and has been cloned a million times. The graphics weren't anything special, so really the only thing special about Flappy Bird is the name Flappy Bird.
I played the helicopter one as a flash web game when I was back in school some 20-25 years ago! Was one of the earliest simple time waster games (in a good sense) that I can remember being really addictive, the whole class would end up playing it in computer lessons until it got banned.
As for the crypto piece of this puzzle, cybersecurity researcher Varun Biniwale pointed out hidden pages from the Flappy Bird website that indicate there may be such a component in the game’s launch. One page that seems to have been removed (and is archived here) said Flappy Bird will “fly higher than ever on Solana as it soars into web 3.0,” and invited players to “build, create, play and stake to own.”
I mean on one hand I do think it’s fair that with him abandoning the game with taking it off stores and not using it all for him to lose the trademark. On the other, I think it’s bullshit someone else can then claim it. It should just be public domain