This is already happening, and not just random youtubers either - dedicated Sim racing channels have been singing LFS's praises for years.
There was a resurgence a couple of years back with the advent of VR, when LFS was making headlines because of its seamless VR integration, but since then it's calmed back down.
Until something substantial in the way of updates comes along, there's no point throwing money at promotion. For now, at least...