If you’ve seen a picture on Lemmy, you’ve almost certainly seen a WebP. A fair bit of software – most egregiously from Microsoft – refuses to decode them still, but every major browser has supported WebP for years and since superior data efficiency compared to JPG/PNG means is already very widely used on the web. Bandwidth is not that cheap.
It can do both, lossiness is toggleable.
If you’ve seen a picture on Lemmy, you’ve almost certainly seen a WebP. A fair bit of software – most egregiously from Microsoft – refuses to decode them still, but every major browser has supported WebP for years and since superior data efficiency compared to JPG/PNG means is already very widely used on the web. Bandwidth is not that cheap.