Arguably anyone else who can provide a similar level of trustworthy authentication that they are not a bot can work with Google to get support. Fundamentally this is a trust based problem and only OS providers are even capable of building such systems. There are very few of those out there. The key is that the systems need to be locked down to prevent automation of input and that automatically disqualifies most android alternatives that the community likes. It's clear that Apple offers this capability though. I can imagine a more locked down version of Windows also providing this in the future.