- Cry about it and hope they change the policy (they won't)

- Accept using your cell data at school instead of their wifi (works, but is expensive)

- Bypass it using a VM (requires moderate technical knowledge, networking skills and possibly the ability to bypass vm detection)

- Reverse engineer it and crack it to behave the way you want (requires some pretty advanced technical skills)

As such, the vast majority of people will just go ahead and install it. This is the problem with these sorts of applications...