This feels like a troll, but I'll respond anyway.
There is no standard and free audio API on Linux.
Wrong on both accounts. Both ALSA and Pulseaudio are available on pretty much every Linux distro. Pulseaudio is generally regarded as the standard these days, but you can target ALSA if you really care about supporting the minority of Arch and Gentoo users without Pulseaudio.
Both of these are free (both libre and gratis), with the GPL family of licenses being the FSF's gold standard.
As for your claim about the LGPL, I am not aware of any evidence that supports your interpretation. In fact, the existence of Linux ports for numerous AAA games indicates that many large companies do not consider the risk significant. Furthermore, courts are generally quite conservative, and prefer to avoid disrupting existing arrangements where possible. The idea that the LGPL was explicitly designed to enable the use of libraries by non-GPL'd programs, combined with the number of companies relying on it, means that regardless of ambiguities in the actual wording, the chances of the LGPL being turned into a regular GPL are slim to none.