i agree with your last point, marrow. ive been thinking a lot about this lately. at its heart, i think this addresses a broader question of originality, beyond just sample packs.
first of all, this isn't just a thing in music, it happens in every medium. i go to school for graphic design, and my classmates complain a lot about how things like Weebly and Squarespace are supposedly killing web design. they argue that these website templates dumb down design and take clients away from "real designers," but i'm not sure i buy that 100%.
every time an art form gets pushed forward, people copy what's popular. if it wasn't future bass dudes and cymatics, it would be something else. like, how many businesses in the 1960's opted for the EXACT same Swiss-style branding? enough that Helvetica is prevalent enough to literally make a movie about it, for better and worse. or, how many producers were downloading presets to emulate Scary Monsters in 2011? a lot, but in the meantime skrillex has moved on, and that sound has gotten totally played out.
as for them literally stealing+selling sounds, they should probably get slapped with a hot lawsuit, but i think that isn't what ur talking about. there will always be others who take shortcuts, but chasing the flavor of the month only gets you so far. the more time you spend chasing someone else's 'wave', the harder and harder it gets to make your own, yknow?
tl;dr - be genuine, make music you care about, and try to inspire other people to do the same.
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