Recently several users have stated that BAS is being detected by fingerprint com site.
Report usually looks like this: "If proxy is set, proxy, site will mark you as using VPN, https://imgur.com/Kg1epHb"
The issue is caused by TCP fingerprinting and has nothing to do with BAS. Here are several tests to prove this:
It is possible to spoof TCP fingerprint only on proxy level, so you should contact your proxy provider to fix issue.
Read more https://incolumitas.com/2021/03/13/tcp-ip-fingerprinting-for-vpn-and-proxy-detection/
Test https://browserleaks.com/ip - "TCP/IP Fingerprint"