From the report, it sounds like a good thing, for the product and the team morale.

Strangely the math looks such that they could hire nearly 1 FTE engineer that works full time only on "little issues" (40 weeks, given that people have vacations and public holidays and sick time that's a full year's work at 100%), and then the small issues could be addressed immediately, modulo the good vibes created by dedicating the whole group to one cause for one week. Of course nobody would approve that role...

The unkind world we live in would see this role being abused quickly and a person not lasting long in this role. For one, in the wrong team, it might lead to devs just doing 80% of the work and leaving the rest to the janitor. And the janitor might get fed up with having to fix the buggy code of their colleagues.

I wonder if the janitor role could be rotated weekly or so? Then everyone could also reap the benefits of this role too, I can imagine this being a good thing for anyone in terms of motivation. Fixing stuff triggers a different positive response than building stuff