Creating and maintaining software is a lot of work. I make small annual contributions to support software development, such as Processing, Scratch and Wikipedia. I have supported Sonic Pi via Patreon (no longer do so, because I am uncomfortable with subscriptions).
I would prefer to have the option to contribute to Sonic Pi on an annual basis rather than on a subscription basis. The Blender Software Foundation has this option. I think you would get more contributions if you allowed the option of one time contributions.
The thing I don’t like about subscriptions is how I would end them if I pass away. Hopefully you will change the Patreon options to allow one time contributions.