The watchdog has already got an agreement with Dixons Carphone, BT, Dropbox, Google and Mozy to make changes to their contract terms. Now the CMA got the key cloudy types Amazon, Apple and Microsoft to agree.
Taking the pledge means not hiking prices on a whim or making the terms and conditions too complex.
Andrea Coscelli, CMA acting chief executive was pleased that Amazon, Apple and Microsoft had joined their seven rivals and agreeing commitments to improve their terms and conditions.
“Millions of cloud storage users will benefit from fairer terms which will help them make the right choices when using cloud storage services,” he said.
The CMA started a campaign in October last year, writing an open letter to storage cloud providers, and has so far got most of the household names to sign up.
The outfit will monitor firms terms and conditions and expects firms to do the same to ensure they can keep up with the law and make sure conditions are as fair and clear as possible.
“People rely on cloud storage to keep things such as treasured family photos, music, films and important documents safe, so it is important that they are treated fairly and should not be hit by unexpected price rises or changes to storage levels,” added Coscelli.