From the link:
But it is MIT, can't I use it for free?
Yes all projects are under MIT so the community backing honesty system can be ignored and Fody used for free.
Do I need to be a Patron to contribute a Pull Request?
Yes. Users must be a Patron to be a user of Fody. Contributing Pull Requests does not cancel this out. It may seem unfair to expect people both contribute PRs and also financially back this project. However it is important to remember the effort in reviewing and merging a PR is often similar to that of creating the PR. Also the project maintainers are committing to support that added code (feature or bug fix) for the life of the project. Pull Requests from non-Patrons, that are of significant value to the larger Fody user base, may justify the effort in reviewing and merging.
Do I need to be a Patron to raise an issue?
Yes. Users must be a Patron to be a user of Fody. As such when raising an issue (question, bug or feature request) and not a Patron, the issue may not be actively triaged, and eventually closed as stale. Issues from non-Patrons, that are bugs and are highly likely to affect the larger Fody user base, may justify the effort and be handled.
Also, the minimum amount is $3/Month: which surely isn’t near enough to pay for their time! Many developers can afford $36 a year, and if not, a developer can still use it for free (BSD licence) and maintain their own branch.
https://opencollective.com/fody/contribute/patron-3059/check...