I don't understand the enthusiasm for Open Collective, they are a for-profit, VC-backed, private company that take 10% of your money (+ 2.9% + 0.30c fee from stripe).
https://liberapay.com/ (specifically the "Teams" bit), seems like a great alternative to this - and fees can be as low as 0.6% / €0.59.
Liberapay is just missing the startup-style hubris :/ (and the sexy website)
social.coop is a cooperatively-run corner of the Fediverse. The instance is democratically governed by its members, who generally share an interest in the co-op model, but topics of discussion range widely.
Our instance is supported by sliding scale contributions of $1-10/mo made via Open Collective. You must have an active Open Collective account to apply for membership; you may set one up here