This is not about 'the open source community' this is just about Redis. The open source community is doing just fine (and Redis is doing just fine), no need for overbroad or inaccurate claims.
Besides that the obvious point is that every open source producer is entirely free to release their product under whatever license they see fit and if you don't like it then simply don't use the product.
Besides that the obvious point is that every open source producer is entirely free to release their product under whatever license they see fit and if you don't like it then simply don't use the product.