Sure, but the marginal benefit is almost inexistent. When you have billions (or tens/hundreds of millions), an extra $12k is practically nothing.

This makes me think of mail-in rebates for electronics, at a different scale. It's also weird to me to see an engineer making over $100k/yr to buy a hard-drive or GPU with a mail-in rebate, then put in the effort to send in the coupon to get that extra $10 back (I've done it myself, but I don't earn that much). To someone making >$6-8k/month, $10 is peanuts. That's also how I see this $12k for billionaires.

There aren't enough billionaires for this to translate into meaningful savings, if it's mostly billionaires who don't bother.

And the people earning more than $1000/hour can pay their $30/hour assistant to do it for them.