Even the team working behind this might not have a clue on release date.
this is applicable for few bucks projected leaded by 2 high-school students. but this is little bit different scenario, we are talking about 1.5M USD project. Based on my experience with similar projects in enterprise, there is always project management, milestones, regular communication and ETA for delivery, which is adjusted every week..
I really hope, that ETA is known.
You may also know that when it comes to software it is frequently delayed. Any ETAs are simply guesses. There are always issues that need to be resolved, and you need to first figure out how to solve them before you can actually do it. This means the variance is huge. Sometimes a bug is fixed in one line of code after five minutes, sometimes it leads to a complete redesign of a system.
I'm not making any statements about this particular case because I'm not informed enough. But software is something that is constantly improved by developers. You shouldn't be talking about release dates and ETAs because those things are almost meaningless. What matters is the speed and quality of development. So we shouldn't ask when it's getting released, we should ask if they're putting enough developer effort to be worth $100,000 a month.