Hi Marko,
You are correct regarding “… gaps between the answers…” – hopefully this is fixed now and we will be replying properly now.
Regarding “… multi-vendor solution like WC Marketplace…” – I didn’t test it, but there should be no issues. Crowdfunding products created by our plugin are generally standard WooCommerce products, so multi-vendor plugins should process it as standard products. I would suggest testing it with free plugin version first, or alternatively – as there is “30 days no questions asked” refund policy on WPFactory, in case if something is not working as expected, we will gladly issue a refund or if you wish I could try to fix it asap (however, as mentioned, there should be no issues with multi-vendor plugins).
Hope that helps and please let me know if you have any questions.