505 Games has probably got return for their investment already. They bought the rights with 7,75 million, got over 10 million from Epic and % of the sales. It's not like the game will stop making money for them. Their relationship with Remedy went sideways and now they are trying to milk it for every penny they can get because the likelihood of them ever publishing another Remedy game is close to zero.
If the relationship between 505 and Remedy was okay/decent, they might have partnered up on the next game as well, but as we know Remedy went with Epic. Remedy had to deal with the backlash from being sold only on EGS and now this. Granted, they might have had a say (or at least gotten some money) on the Epic deal, but it could have soured their relationship. Remedy chose to cut out the middleman by going directly to Epic with their next games, which might have pissed off 505.
I doubt 505 Games made many friends with the way they handled the game and Remedy. They are trash tier publisher to begin with, with very limited amount of decent games under their belt. Remedy always talks about establishing brands, the long game and are generally quite aware of what reaction their moves (or publishers movers) make. They've had to deal with Alan Wake backslash (PC release postponed by MS) etc. This move has 505 Games written all over it, such a shame Remedy takes the hit as well when their hands are pretty much tied up. Luckily for Remedy they are not in such dire position as they were back in 2017, so scooping them up is not that easy. Their stock has gone up from 13.80 to 30.50 during corona. Last time I checked, it was 20 euros and something and that was in July. Should have bought their stock when it was a lot cheaper :)