"Not making a stand" would be leaving everything as is, and handing your encryption keys over to the government. By loudly disabling ADP and saying this feature is illegal in the UK (they really should have said "illegal" instead of "unavailable" so people would know it was the government), they are at least making half a stand. By leaving it enabled in other regions and for visitors from other regions to the UK, they're making three quarters of a stand.
For example if I encrypt a file locally, a zip file containing images, am I not permitted to upload that zip file to a cloud service in the UK?
Even if the UK's demands were "access to encrypted cloud services", does that also mean encrypted files within encrypted storage? It all seems so messy. Anyone who really wants to hide their files, can do so regardless of demands for backdoors.