waifu2x.net dropped PNG output support

[nagadomi]

Starting in May 2026, Google Cloud Platform's data transfer prices increased.
waifu2x.net uses about 7 TB of bandwidth per month, so this price increase has a significant impact.
To reduce data transfer costs, PNG support has been discontinued, and only lossless WebP is now supported.
PNG is still available in the Supporters Area (patreon members).

As of 2026, I do not believe WebP causes any practical issues.
If there is a use case where PNG is still necessary, please share it. I would like to take it into consideration.