If memory serves me correctly; I have read that communion in the hand was initiated without permission during the last century by Bishops in South America from where the practice spread and was put into use elsewhere as well, long before an
indult for anywhere was approved, and on previous occasion in some locals, petition for an indult even denied, but the practice still was not halted.
The Constitution on the Sacred Liturgy #22 and canon 838 of the Code of Canon Law prohibits taking personal initiatives in the Mass.
Regardless, we have a rather curious phenomenon taking place in the Church that confuses many, where pastors and faithful, (as initially in the case of Communion in the hand as an example among
several others), are promulgating personal initiatives into the Mass in disregard of the aforementioned canon and norms that have then resulted in indults which have actually been approved by the Holy See. There are even cases of indults expiring and not being renewed yet the praxis' that were permitted by those indults continue nevertheless.
I know of no other instance of this happening in the history of the Church until recent history. Before this recent history, an indult would require approval before it could be implemented. Recently, certain irregularities initiated via personal initiatives seem to have become
indults long after they were put into use without approval. In effects, liturgical abuses are getting approved if they seem to work out rather than corrected.
As the Holy See has seen fit to approve the Bishops petitions for such indults in certain instances, re; the personal initiatives to change things, I must conclude, and chalk it up to a relaxation in discipline and a sort of acknowledgment of the process of
paradosis.
I guess if we all decide to break the speed limit enough, we can force the authorities to raise it.

(and we all hate to go the speed limit).