Are you kidding? Most products and services on the market are tat. They serve no real purpose (regardless of whether they happen to have customers). It would be easier to list the few things which actually do have value.
If you go into a supermarket, there's only a fraction of aisles that are devoted to food worth eating (unprocessed or lightly processed, providing nutritional value). The rest is 100s of types of unnecessary and mostly destructive junk food and alcohol. If you walk into any shopping district or center, only a handful of businesses are ever selling anything with real value and purpose. The rest is superficial and if it were removed from the high street or never existed in the first place, nobody would miss it. The digital market is at least a little less destructive environmentally, but is still crowded with mostly pointless apps and software.
People always bring up supply and demand, but that doesn't negate the argument that these products are unnecessary, unsustainable and destructive. Add to that, they are often predatory and prey (or the marketing preys) on peoples weaknesses and insecurities.
For every one of these companies selling fast fashion clothes that fall apart after a handful of uses, shoes too impractical for daily use or sportswear, expensive hygiene products which hinge mostly on the way they are displayed in the store, and a million variations of CRUD apps for tracking water consumption and a myriad of other things you could just record in a note, whole teams of people are working away in jobs to produce, market and provide these unnecessary things. They're all polluting the environment (either through industrial production, energy use etc.) and peoples minds (for example, Instagram has been highly damaging to young girls self-esteem and similar services are causing unprecedented mental decline in their userbases), and unsustainable, because 9 times out of 10 all of these products and services are flashes in the pan that will be dead or out of trend (increasingly fast these days).
The only justification a lot of this stuff has is that it gives people employment and their livelihoods. Sometimes that element forces people to be okay with abetting something they fundamentally don't like. One of the largest employers in my local city is Sky Bet (a gambling company). Every single person (hundreds of employees) that works there is propping up a "service" which destroys peoples lives.