Certain reimbursements/allowances for volunteering are treated favorably for tax purposes if conditions are met, e.g. ehrenamtspauschale (volunteer allowance).
Also, as Gemeinnützig, for tax and for issuing donation receipts.
It could also function as community service hours ordered by a court (sozialstunden).
If you make a petition with the official website and it passes they have to deal with it, even if its a rejection.
https://epetitionen.bundestag.de/epet/peteinreichen.html