Speaking as someone who used an Audioblocks subscription for a couple of years, first for license-free images on Storyblocks, and then later for sound effects, and eventually music that I intended to use for my videos when I started creating content on Youtube.
First off, the subscription is pretty misleading. You get "access" to a large library of music files but you're not actually cleared to use the files without paying for a separate "indemnity license" which I only learnt about almost a year after I started Youtube. Very sneaky. I was getting non-stop copyright claim after copyright claim, and demonetization notices, months after I put videos up.
