I have T-mobile 5g. My IP shows up as a residential proxy. I can't control the T-Mobile 5g device. It's a black-box. And, I only have one Linux desktop on the home network (so no Windows/Mac malware).
Not sure why my IP is listed as a residential proxy.
You might just be experiencing T-Mobile's CGNAT on mobile broadband?
You're almost certainly behind a cgnat shared with a bunch of compromised/residential proxy running phones and other traffic.
T-Mobile esp. their 5G network is behind CGNAT
There’s only that many ipv4 addresses and I believe all 5G are shared ones. That’s why they’re among the most valuable ip ranges for scraping. You can’t just naively ban that IP or you’ll ban a large group of users