Is it even worth investing in? It would require massive capital spend and the ongoing costs to stay afloat would be similarly high. There is little to no certainty to believe you could acquire users or a revenue model either. None of the chromium derivatives have managed to gain traction other than edge. It seems wiser to invest in the next platform rather than ones with big players already in the space.
Today I was asked to give permission to transmit my personal data to Google Maps to view my train route. I wondered why they didn't use Open Street Maps. Systems exist, but the people with the money don't care to use them.
My new phone is full of many more libre apps than my old phone.