I don't fucking get it... why does someone start a new game where the current one is nowhere near finished. I'm not supporting monthly but afterwards I'll seriously consider if I want to pay for it on release date.
In this case it's because of issues with Patreon and the chance of being banned there is increasing. Once the new game starts it will be available on Patreon and all reference to Single Again will be removed. Single Again will only be available for paid subs via SS.
This is the same thing that happened back in the day(christ that makes me sound old) with Mr Dots and Dating My Daughter. DMD got banned from Patreon so in order to be able to continue development of the game it was made available only on SS and all reference to it removed from Patreon and they developed and released on Patreon, Melody, Sunshine Love and have just started their fourth game called Thief of Hearts.
Of course the key difference is that Mr Dots team were able to maintain a monthly release schedule with each title having an update on alternate months.