I think that the problem is that "open source" in itself is not volunteering.

Just like "masonry" is not volunteering, even though a mason could volunteer by building an orphanage pro bono. But when they build their own house, it's not volunteering.

I don't even think that being paid for building an orphanage counts as volunteering... does it?

Subsidize?

What? How are you subsidizing anything when it's just recognized as volunteering?

You can at most put that on your Einkommensteuererklärung for a deduction on taxes...

Calling that's subsidizing, idk man, feels massively overblown?

And the Steueramt would have to agree with your statement, which I doubt it would for 99.9% of software.

The exploit-ability of this seems severely overstated here, but I'm not a lawyer so maybe y'all know something I dont

Tax breaks are very much subsidies.

A thief only looting half your house is a subsidy.

If the thief keeps looting the full house of others sure. Even more so if the thief uses the loot to provide services you rely on and society as a whole has decided to give the thief the right to loot part of everyone's house.