However, I've found GDPR deletion requests to be a pretty strong cudgel. For the last 10 years or so I've been sending deletion requests for accounts when I no longer need them. Prior to GDPR, about 50% of responses would be along the lines of "in the nicest possible way, we don't care about you enough to do that so please fuck off". Reading between the lines, I assumed that about 50% of websites were implemented poorly and didn't properly support deletion.
Post GDPR, all but one request have been given a polite "we have done as you have requested, we hope to see you as a customer again". GDPR has both legitimized the process of requesting that your data has been deleted after you're finished using a service, and has legitimized the concerns of all those developers who were never able to get engineering time to properly support account deletion.
So it's been a success, it could be succeeding more but I'm not unhappy. I would still like to see at least one company get ICBM'd in order to remind larger entities that they've got responsibilities to society too, not just their shareholders.
[1] https://www.schneier.com/blog/archives/2016/03/data_is_a_tox...