I have no affiliation with the service, but I assume that: 1. They're small 2. They're new 3. Their team has more experience developing for Apple devices, th

I have no affiliation with the service, but I assume that: 1. They're small 2. They're new 3. Their team has more experience developing for Apple devices, thus it was quicker to release for those devices first before tackling Windows, Android, and/or Linux. What they could do in the meantime is create a web-based tool to generate configurations for OpenVPN and/or Wireguard, like Mullvad does.