I've been using Mint on my private PC to play POE/POE2. Works really well. Will probably cut over more permanent in the near future.Especially for casual users. I think that might be where the biggest influx comes from.
Because professionals might require specific programs to work on Linux for which there is no alternative on Linux, while casual users can usually find a decent replacement.
I've been cruising on Linux Mint Cinnamon for months now and don't miss Windows at all.
For work it would be tough. I connect to many customer VPNs and the compatibility with Linux would have to be tested.