Thinking about my post a couple back ... if MrDots is kicking the tires of Subscribestar but DMD as a game will cease after Chapter 2 ends this year, then is it merely a backup in case Patreon goes nuts? Because, as I anticipated above and you said: any desire to bring D and/or her timeline peers into a post-Melody game will necessarily preclude her father from being in an intimate relationship with her (or perhaps even being in the same story, just to be safe). So, one aspect of what makes DMD constantly on the edge will be gone and something will need to take its place if any characters are repurposed.
Cynically, I could offer that placing DMD at Subscribestar feels a bit like bait-and-switch, as DMD has not many installments left. Those editions could have been supported by his other per-installment payment means, so I now see Subscribestar as:
1. A way to gain more easily planned revenue for the final year of DMD, as many fans are excited to see a subscription platform being used once again (i.e., feels like Patreon, etc.)
2. A test as their future Patreon backup or to enable secondary subscriptions (e.g., as Agent Red Girl has done since her recent Patreon scare).
But, it's apparently not a platform for growth of DMD as its own game.
I feel that something should be mentioned on the DMD subscription page to make it clear that the game is in its final chapter, at the very least.