Maybe mushrooms are still in the "build userbase" phase. Soon they will begin with the enshittification, raise the prices, put normal quality of life functions behind a paywall and add ads.
IIRC, this actually happens. When the balance is disturbed, the mushrooms go wild and destroy young sapplings. Could be I recall incorrectly and it's actually other species. I cannot recommend The Mother Tree enough, it goes into great detail of the history of research into this