I like your question but you should formulated better, that’s why it’s getting downvoted.

Short Answer: No, it’s not a flop. Long answer: Many have given the meaning of a flop so I will not repeat. What you want to know it seems is if ERN succeeded as a multiplayer and I get the feeling you are comparing it to FPS, but they have very different markets. ERN made good money and satisfied the Soul-Like gamers Multiplayer addiction. Elden Ring is also not massive when compared to Counter Strike but in proportion ERN is very successful. The learning curve for the Souls-Like games is usually also a detractor for many.