It seems fairly obvious that the "identity" portion of this is more important than the actual cost of providing the storage. Though maybe more folks than I imagine can hit the 5GB limit quickly. I have emails dating back to 2008 and just calculated I am only using 8.5GB. I keep everything so getting down to 5GB would be a hassle more than a challenge.

I would argue that Google really wants to earn your storage dollars. Their constant notifications on my device warning me I was low on space is what drove me to Immich.