BL Official response to the endless complaining in the comments section on the castle set:
Thank you to everyone who participated in Crowdfunding for Series 1, and a big congratulations to SleeplessNight on his very popular Mountain Fortress. The popularity of Series 1 has been incredible and far exceeds our expectations. Looking back, the BrickLink Designer Program 2021 Invitational started off with a maximum of 10,000 sets, and Series 1 planned for 20,000 and was only recently increased to 30,000 sets to help address availability concerns. To dispel any theories, we are limited in scope by our production slot, which is planned with the factory before Submission Intake of the Series even begins. While BrickLink may be part of the LEGO Group, we are still a very small program in the scope of the LEGO portfolio and must work within the production allotment we receive. To be clear, we are not intentionally creating a shortage of sets. That would be a bad business practice, as you can see it only creates upset customers. Unfortunately, the downside of the rising popularity of the BrickLink Designer Program is that we do not have the ability to match production capacity in real time. We appreciate your enthusiasm for the BrickLink Designer Program and look forward to bringing you many more incredible fan designs in future Series!