Did you have asked them about special pricing? Seems like they over special pricing (perhaps even free?) to open source projects:
https://feedback.canny.io/feature-requests/p/early-stage-startup-discount-cheap-plan-or-free-tier

If you think canny could help you to get an better overview compared to discourse that could be a good idea. Perhaps a public “roadmap” like this would also stop duplicate feature requests.

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