I always find it interesting that people who have extra money won't just donate to the government. Instead, they advocate the government take it from them and from others. It's not a coherent position.
And EUR 500,000 is hardly a "fortune" - that's about GBP 400,000 which is the price of an ordinary family home in the South-East of England, or the price of a two-bedroom flat in central London. So effectively, this is an upper-class heir to a family fortune advocating higher taxation on the middle-classes and professionals.
44 people have signed a partition to propose a tax law that will negatively affect 2.2 million people, am I the only person who sees something very odd with that. This is nothing but a bullshit PR move by some rich heirs to try to buy some good will.