I am surprised how photopea can be so feature complete and still run on an ad supported model. It doesn't have all the bells and whistles or Photoshop but cover

I am surprised how photopea can be so feature complete and still run on an ad supported model. It doesn't have all the bells and whistles or Photoshop but covers 99% of the use cases without having to keep paying for a subscription. I pay for Adobe's photography bundle but primarily for Lightroom; for any other image editing I just go to photopea.