Yes and sites can also fairly reliably detect when a user is coming from a well known IP address block belonging to a VPN or VPS provider. It’s a built in feature of I know at least AWS
Assuming you are using a "well known IP address block belonging to a VPN or VPS provider", yes, but it is also possible to setup VPNs/proxies outside of well-known IP blocks.
https://aws.amazon.com/about-aws/whats-new/2020/03/aws-waf-a...