well well, maybe this list I compiled is of interest to you then:
Abyss: Re-selling cheap cables for dozens of times more.
BGVP: Lied about the DN2 having a Beryllium DD when it was a PET driver.
Campfire Audio: Terrible QC with the Solaris and when people reacted negatively to that on Head-fi, their rep started locking threads. (Also used Bellsing drivers in it.)
DQSM: Made an account on Head-fi and wrote positive reviews and defended their products from negative ones.
Hidizs: Stealth revised MP145
Ksearphone: Bad QC, horrible CS, refusal to replace faulty products, “bait and switched” Bell-LBS for Bell-LBBs.
KZ: unsoldering the BAs doesn’t affect the sound, DQ6 having DDs that are glued shut, claiming their MST driver is an electrostatic driver, MST driver that is not audible, Tyvan Lam (CEO) trying to bribe HBB into destroying another company’s driver claims. CRA stealth revision. TRYING TO PAY REVIEWERS FOR REVIEWS (1000 usd offered to DMS).
KBEAR/CCZ: Re-releasing the same iem over and over and managing to placebo “reviewers”. Claimed the BElieve used a pure Beryllium driver, it is only coated. Plume using Bellsing not their own drivers. (Discontinued after DeltaFyre dissected it.)
IMR: CEO ran a scam called Trinity on kickstarter where customers never received their products and the money was used to fund/develope IMR.
Moondrop: Urged their fans in China to “attack” Dunu.
Seeaudio: Bravery limited edition being re-released in different color
Senfer: 150ohm earbud was claimed to use Beryllium driver, it does not.
Shuoer: Tape driver lie (MST, not Electrostatic). Changed the tuning of the EJ07M KL from the originally marketed tuning by HBB.
SIVGA: Censoring bad reviews
Soundcore: TRYING TO PAY REVIEWERS FOR REVIEWS (DMS).
Tanchjim: Stealth changed the Oxygen driver
TRN: multi-core cables not having all wires soldered, EMX driver lie
Urbanfun: As the YBF-ISS014 hype went up, the price did as well, lied about the price increase being needed to fix bad QC and it was RNG on whether you got the Beryllium coated DD or the “noble metal” version.
YinYoo: Stealth changing tuning/driver, bad qc, review tinkering. (banned on Head-fi)