Some of us currently (or have) and will continue to contribute upstream, but there is also nothing fundamentally wrong or unhelpful by making a fork. At it's core the Lemmy ecosystem is about federating and having instances talking to each other- And all of this can be done in any particular language or feature set so long as the apub spec is maintained and the data sets remain compatible in some form. Personally I think it's healthy for the project to have choices as someone still needs to setup, configure and run a lemmy- some might like the lighter footprint the rust version provides, and some might like the easier setup (or ease of slight personal tweaks) a typescript might provide.