Android shouldn't be a loss leader at this point, though maybe it is in certain companies, and it's not exactly what most people think of when they think GNU/Linux.
Steam Deck is only being successful by translating Windows on top of Linux.
Valve failed to convince any major number of studios to bother about GNU/Linux, even when it would be relatively easy to port their games from Android NDK.
Android shouldn't be a loss leader at this point, though maybe it is in certain companies, and it's not exactly what most people think of when they think GNU/Linux.