When you land on a site like pimg.1px.tw, the first question is always: who is behind it? In this case, that question has no answer. The domain registration data is effectively hidden, there is no about page, no contact information, and no social media presence. For any site — whether it's an image host, a redirect service, or something else — that level of opacity is a red flag.
On the technical side, things look fine. The site uses Cloudflare, loads fast, and has a valid HTTPS certificate. But good infrastructure does not make up for zero transparency. A legitimate service run by real people publishes a way to reach them, some legal terms, and a basic history you can verify.
There are no pimg.1px.tw reviews to consult because the site has no footprint on Trustpilot or in the Wayback Machine. Combined with the hidden ownership, there is not enough evidence to call this site a scam — but there is also not enough evidence to call it safe. My advice: avoid it until the people behind it choose to show themselves.