Seems like we have licensed krops as MIT because Googlepeople coudn't use it otherwise[1]. This is was a stupid decision back then and it still is.  If anyone cannot use a WTFPL product, then they should become creative.

To resolve this task:
1. find all contributions done under MIT 
2. get relicensing permissions from contributors (using spam@krebsco.de); specify a deadline until which we need an answer
3. delete all commits for which we couldn't get permissions

[1]: apparently Googlepeople gained the ability to use WTFPL, at least there is no https://opensource.google/documentation/reference/thirdparty/licenses#wtfpl-not-allowed entry anymore (referenced from https://news.ycombinator.com/item?id=18229988)