I agree, this laptop would be good for using public wi-fi which can be more insecure to use, and you do not have to worry about losing a more expensive laptop which cost $500 or more dollars when using it in a public place.
This laptop uses a Mobile/ARM CPU like the Raspberry Pi, Nintendo Switch, and Smartphones, so Windows 7 is unlikely to work on it. Windows 7 is mostly install on Intel, AMD, and VIA x86/PC CPUs.
You maybe able to install Windows 10 for ARM/Mobile or Windows RT which is compatible with ARM/mobile processors. There are also a lot of Linux, and Android operating system which can run on ARM/Mobile CPU.