Your donating on there behalf so they get a tax break.

No, they don’t.

That’s not how that works. If they wanted to use it to lower their taxes, they’d need to accept the donations as revenue first making their total deduction net zero

How would that happen? You donate $20, the company accepts that as revenue, donates it, writes of $20. The net effect of this is zero.

No, they don’t. In order for them to receive a tax credit for it, they’d have to take those donations as revenue first. They can’t just claim a donation of someone else’s money on their taxes.