It just saves a bit on natural gas, hardly a renewable.
Given the timeframe countries have set for 100% renewable aims, there's no more time to waste subsidies for these halve measures ... there's only time for a couple years planning and then starting construction on 100% renewable megaprojects. If existing piping can't take 100% hydrogen without embrittlement, then they'll either need to convert the hydrogen to hydrocarbons with atmospheric CO2 or give up on using hydrogen with the natural gas distribution network.