Disclosure: I have pledged a small amount for the Kickstarter campaign.
It’s a shame more crowdfunding campaigns don’t go this route, but if you offer a way to test-drive the product before you pledge, you are more likely to get backers. I understand it’s not always possible, but for many items – Role-Playing Games (RPGs), books, and various other things, you can do this. Here’s the limited playtest version – https://thedeckofmany.com/products/humblewood-playtest (bit over 92.5 MB zipped file), you have to create an account, but there is no charge. I downloaded a free copy of the playtest version earlier today. The Kickstarter campaign is at https://www.kickstarter.com/projects/hitpointpress/humblewood-campaign-setting-for-5e-dnd (I have pledged a small amount to this campaign) – fully funded $393,764 pledged of $20,000 goal (as of March 30, 2019); 6,095 backers; 11days to go (ends Thursday, April 11 2019 9:00 AM CDT)
.Official website: https://thedeckofmany.com/
Here’s their Patreon page: https://www.patreon.com/thedeckofmany.
YouTube video: The Deck of Many: 5e Reference Cards (Kickstarter Video): Deck of Many Things Humblewood Kickstarter https://www.youtube.com/watch?v=KnnQ50DBhn4