The market has spent the last few years demonstrating that the sustainable number of large companies whose main product is open source is...One. (Red Hat, if you were wondering.) Even trying to become that kind of company requires a highly speculative VC-fuelled trajectory, which is famous for turning sustainable 100m-scale companies into 1% unicorns and 99% rubble.
Even Docker, which utterly transformed its target market, is barely making any revenue ($25m/year on a $1.3bn valuation). All its value is busily being subsumed into Kubernetes, itself a loss-leader from a company (Google) that makes all its money from something else.
Anvil-the-company is sustainable, profitable, and growing, and Anvil-the-product is getting better all the time, because we charge for what we produce. We would love to be able to give it away and keep doing that - but basically, we can't.