Why the mean-spritited comment?
Capcom are almost 100% never going to release another Speccy game. They might or might not do better than this. (Probably not, I’d say.) But why, in your hypothetical, do you assume the worst?
This game here is not illegal. It’s a love-letter to a 30-year-old game. It’s a fan-remix. An homage. It’s probably ‘fair use’ (but who knows?). Enjoy it! Or don’t!
It's not a simple copy of a videogame, it's a complete remake with a different TITLE and, of course, it doesn't to be an official release and being endorsed by Capcom or any other company. It's just a 'fan made' conversion as many other freeware or shareware remakes from arcade or console videogames for the ZX Spectrum, that's all. Moreover, their authors possibly don't want to get paid for this piece of gold. As it's free downloadable (for now), there is no need to argue or complain, while this game may remain as freely distributed only if zxpresh desires it or not.
Since many years ago, many people (programmers and little software houses) released unofficial conversions of coin-op arcade machines, or just inspired in them and, as far as I know, nobody said nothing.
El autor no está pidiendo dinero por el juego, así que algo que no reporta beneficios, para una plataforma que ya no se comercializa, ni es ilegal, ni aunque lo fuera Capcom va a mover un dedo contra él, es un homenaje, no una copia para lucrarse.
Deja que los fans de la máquina disfrutemos de este tipo de publicaciones, y se nos demuestre hasta que punto puede llegar el Spectrum en la actualidad.
Vive y deja vivir.
para éstos casos hay una frase: "es más papista que el Papa". A Capcom le da exactamente igual, ni sabe que existe el Spectrum a dia de hoy, ni hay dinero involucrado, ni ... que no, que siempre tiene que haber un "inspector de hacienda" a decirte que tienes que pagar impuestos por una venta de algo de segunda mano que vendiste hace 5 años por 1euro, que sino eres ilegal... pos ná. Ignorar y a disfrutar.