Monster pioneered the premium audio accessories business, starting with thick, oxygen-free copper speaker wires before moving to more questionable interconnect cables and other accessories, eventually landing on headphones and Bluetooth speakers. The original speaker cables were genuinely (and demonstrably) better than the thinner wires due to a combination of physics and quality control. They sold well because Monster did a tremendous job on marketing at point of sale; in some years, they made up the majority of consumer electronics retailer profit (sell the TV and VCR at cost, make money on the cables). With the rise of the Internet and streaming media players, the market for premium branded cables took a big hit - Monoprice, Anker, and AmazonBasics can supply perfectly good cables for less, assuming that you even need to buy an audio or video cable at all.
Today, Monster is a licensing company, but it is not surprising that one of those licensees (DealRise, LLC) sells super-premium HDMI cables under the Monster brand. Their PR rep offered to send over an 8K cable in any size; I asked for 8', they sent 6'. The packaging is beautiful -- probably not fully necessary, given that Amazon is a primary retail channel, but still expected for the brand -- and the cable itself appears well constructed. I wasn't able to fully test it because TVs are so big now that a 6' cable is now too short to reach from my receiver to the TV input, and I don't have a full HDMI 2.1 electronics chain yet. The Xbox Series X from Microsoft is fully capable, but my flagship Denon receiver (AVR-X8500H) has not gotten the promised HDMI 2.1 update yet. Finally, while the fantastic 6-series TV that TCL sent over supports some advanced gaming functionality, it, too, lacks HDMI 2.1 inputs.
However, if you do have a fully HDMI 2.1 chain and want to take advantage of things like 8K or 4K/120Hz gaming, you will actually need cables rated for significantly higher bandwidth (48Gpbs) than even the best HDMI cables from just a year or two ago (18Gbps). Do you need a brand name like Monster 8K to achieve that? Not necessarily, and I can't vouch for Monster's performance yet. But the technical requirements are real. If you run into HDMI 2.1 equipment incompatibilities -- something we have seen with some early HDMI 2.1 A/V receivers -- it could be difficult to isolate that the problem is actually the interconnect cable, so it's worth buying something you trust will deliver the performance you'll need.