TBH not really surprised. Disappointed? Yes.
In terms of Milking, Patreon, Stealing etc. I really don't care that much about it. Blatant stealing...sure. But let's be realistic. Silver is never coming back to this game. In fact, after Glamour, I don't think he is getting into adult gaming again.
People can complain about Silver all they want, but he delivered a pretty complete game from Jan 2017 - Feb 2018
Basically, he wrote a complete game in just over 1 year. This one has been in dev for 5 years and not even at the same place as the original. If Silver were to come back to this game, and resume where he dropped off, it would be an instant success (I mean I would start playing it again).
TLDR, Stealing does not really apply here, since the original dev is not continuing on the game and people supporting this game are fools. Let them throw away their money.
Looking from a Dev's perspective, continuing on someone else's game... not something I would do, but I really liked the original, and the original actually had some closure and did not end on a cliffhanger, I was interested to see how someone else could take the story forwards with our favourite characters.
I mean all the hard work is already done for him - The character types are already established - Kira - Wild Aunt, Ann - Strict Milf, Alice - Rebel Tsundere older sister, Lisa - Naive but curios younger sister and lastly our already resolved Antagonist and optional NTR actor - Eric.
Everything is basically already done. The story is ready for a blank slate to continue with everything already established and setup. But yes... they fuck it up. So yes, I'm disappointed, but not heartbroken.