What are some alternatives?
BountySource - BountySource is a funding platform for open-source bugs and features.
Gitbo - Gitbo aggregates public issues from GitHub and ranks them based on a popularity algorithm, so...
Liberapay - Liberapay is a recurrent donations platform.
Softagram - Automated visual reviews for GitHub pull requests
Ko-fi - Ko-fi offers a friendly way for content creators to get paid for their work.
Patreon - Patreon enables fans to give ongoing support to their favorite creators.