It doesn't seem like a security issue by DO in any way. It seems that the fog api (the project this 'issue' is filled for) doesn't allow a user to access the required flag to scrub the drive. Not a DO problem in any way I can tell assuming the scrub parameter is working correctly.
This is a well-documented situation that almost every provider of 'consumable infrastructure' before DigitalOcean came along has faced and solved.
It is disheartening to see the same mistakes being made.
Whilst I absolutely see their USP was always solid-state storage, and that has pitfalls in terms of how you can scrub data to avoid it being leaked, the platform should take every precaution to protect customers data.
There shouldn't be an option to 'scrub data' and it shouldn't be defaulted to off so they can save some hassle, and avoid spending a few dollars. It shouldn't be an option because it should be on all the time, anything else is surprising the customer mightily.
"What do you mean, my data leaked? Oh that's fine" -Nobody
"Why'd you pick a provider who doesn't take our companies information security seriously?" -Every boss anywhere
It is absolutely a DO problem in two ways: 1) they default to bad behavior and 2) their UI does not make it at all clear what the consequences of that bad default actually are.