Video game reviewers used to provide a valuable service. Back when all video games were Nintendo expensive, we needed trustworthy reviewers to guide us towards making the correct purchase. Paying the inflation-equivalent of $100+ for a single video game made a single bad purchase really hurt.
Nowadays, people log on Steam and scroll through hundreds of previously purchased (never played) games they picked up for a few dollars each during a Steam holiday sale 3 years ago. They can just click download and start playing anything that tickles their fancy!
Plus I’d also add that many gamers have found games that have enormous replay value (especially multiplayer games like League of Legends or Hearthstone or Fortnite) and they sink thousands upon thousands of hours into that one game.
What room is there for professional game reviewers reviewing new games every week and writing about them? Most gamers seem to have more games than they could ever want, plus single games that could last a lifetime by themselves.
The same could really be said for music reviews. People used to read magazines like Rolling Stone in order to get reviews of the latest songs from the hottest bands. Nowadays people just listen to the music themselves and decide whether or not they like it, no reviewers needed.
Edit: I forgot to mention streamers and lets players. People can watch a lot of these videos by amateur or professional content creators and judge whether or not they like the game based on how it plays. Reading an article, even a very well-written one, pales in comparison to a gameplay video at the job of communicating how a game looks and sounds in motion.