Sorry, but this is completely wrong.
Windows has ACLs and they are an important part of Windows administration, and used extensively for managing file permissions.
Windows has supported ACLs on NTFS since Windows NT & NTFS were released in 1993 (~~possibly partly influenced by AIX ACLs in the late 80s~~ influenced by VMS ACLs introduced the early 80s).
ACLs were not introduced to standard POSIX until c.1998, and NFS and Linux filesystems didn't get them until 2003. In fact, the design of the NFSv4 ACL standard was heavily influenced by the design of NTFS/Windows ACL model -- a specific decision by the designers to model it more like NTFS rather than AIX/POSIX.
Technically, at the filesystem level, exFAT also provides support for ACLs, but I am not sure if any implementation actually makes use of this feature (not even Windows AFAIK, certainly not any desktop version).
Users get a service, so it can be argued they are paid in kind. That's the price of their "free" services.
Whether you agree with that or not, websites are unlikely to pay users to use their services (unless they're at least providing content) any more than a coffee shop would pay its customers to drink their coffee.