Video games. Streamers, YouTubers, and other ”content creators” have had a massive negative effect on the hobby as a whole.
The bandwagons driven by these people can destroyed games that should have had a mediocre reception, but instead were panned by a couple creators then that criticism was parroted loud and wide. Where a game could have had a nice little niche audience, instead it was shut down a year after launch due to the shitty bandwagons.
These people also drive companies to make horrible balancing and content decisions. Since these people play games as their jobs, and play them daily for 8-10-12+ hours, they have wildly different desires and perspectives on games. These perspectives again get parroted loudly, the game companies hear it, and make changes/decisions based on people that play all day every day. This destroys gaming for not only casual gamers, but all gamers that don’t play one game for 8+ hours a day every day.
I could go on and on, but these trash reality TV stars for nerds have done so much damage to the industry.
I'm not sure how streamers and such are influencing developers negatively when most of them shit all over the bullshit game developers constantly do that actually makes games suck like lootboxes and live service garbage. Most devs don't seem to listen to streamers even when they parrot what a majority of the players also say.