When you visit collector-pxaotqiwnf.px-cloud.net, you're met with a blank 404 page. That's the first and most important signal: this isn't a real website you can interact with. The domain is a subdomain of px-cloud.net, which is used for bot protection services, but the specific collector endpoint appears broken or abandoned.
Legitimate infrastructure endpoints from companies like PerimeterX typically have documentation, support contacts, and clear ownership — none of which exist here. With no WHOIS record, no privacy policy, and no way to verify who operates this domain, there's no foundation for trust. The fact that it's not on any blacklists and has a valid SSL certificate are positives, but they don't outweigh the fact that the site doesn't serve any content.
If you encountered this URL while browsing another site, it's likely a bot-detection tracker that failed to load. It's not a phishing site, but it's also not something you should interact with directly. For a collector-pxaotqiwnf.px-cloud.net review, the honest answer is: there's nothing to review.