I wonder if it being so long is part of the filtering process. Only good recruiters will read the whole thing and bother to reply.

I personally believe it is unnecessarily long, formal, and diplomatic. It does not fit who I am and, if I were to read it, I would have the impression of an annoying and insincere corporate speak.

I believe I can achieve all the goals of being polite, respectful, considerate, and filtering for serious offers with a much, much shorter and informal response.

Something like:

Hi X, thanks for the contact. Company Y sounds interesting and I do think I might be a good fit for the role. I am not actively looking for a new position now, but i’d like to know more about the job description and compensation details. Thanks!

This should all be sincere if course. If the company does not sound interesting (like all crypto for me), I only reply a respectful “no” ( ”Thank you for the contact, but I am not looking for a new job right now.” ). Similar when job is for roles that I have no experience whatsoever, which often happens. In this case I also mention that I am not a, e.g., Android engineer (I am a web frontend).

Also, if there is no company or role mentioned, I give the first reply, but obviously removing the acknowledgment that I like the company/role and ask for details about it too.