Earlier quoted context omitted.
I think using the system they used to provide a hotfix for a browser-breaking issue does not clash with the spirit of their prior pledge. I feel a complaint like this verges unhelpfully in to the pedantic.
As someone who opted out of Studies after the last abuse, I felt betrayed that my addons were, effectively, held hostage behind enabling both telemetry and Studies. I decided to wait. It’s bad optics at the very least. Users who opted in for the update were in fact entered into studies they explicitly wouldn’t have wanted to be in without the lure of an earlier update.
We are also completely deleting all Telemetry and Studies data received in the week following the incident to ensure we respect people who had concerns like yours, but enabled Studies in order to receive the hotfix.
Specific details and timestamps are in the post at https://blog.mozilla.org/blog/2019/05/09/what-we-do-when-thi...