The advertised house edge for Stake's in-house Black Jack is 0,5%, which means long-term I will lose 0,5% of all bets placed.
No, it does not mean that, and it has never meant that, especially as it applies to BlackJack. "House edge" does not equal % of losing bets, because some wins (Blackjacks, double-downs) count as 1 bet but pay more than 1 bet's worth of winnings. This has been explained to you dozens of times already but you continue to repeat the same incorrect assertions. Furthermore, the excerpt you quoted from Stake explains in detail why you will never receive any sort of compensation from them.