7.5M euro is not a lot of money. It's a decent amount of money to have to start doing something useful with it...or burn it all away.
I'm always surprised how HN is disconnected from the reality sometimes. It's basically 197 k$ a year until he "retires" at 65 in 38 years. And that's if he's keeping the money without investing it.
Without any gain through investment, only maintaining the money on par with inflation (the real life one not the projected one that this or that EU government publishes) you can imagine it as constant draw or stipend.
That is roughly double what (I would call) a more than average pay in EU (50,000 Euro year net of taxes).