From what I understand, the exemptions only allow jailbrakeing/rooting with permission from the Manufacturer, which I highly doubt would be given from 80-90% of manufacturers
See also this timeline of the EFF's efforts in getting DMCA exemptions: https://www.eff.org/issues/dmca-rulemaking
[0] https://en.wikipedia.org/wiki/IOS_jailbreaking#United_States