Filtering is not necessarily a good user experience and comes with a cost to do. Google making a model they expect there to be demand for is not just an excuse.
They don't expect to make money serving Gemma; it benchmarks worse in almost every way than their closed-source Gemini. Believe it or not, one of the main sources of demand for these small, non-SOTA models is people using them for roleplay locally. Anyone corporate has the money to use a bigger, more effective model.