Greed, sometimes. Gotta get those usercounts high to get acquihired / to sell out / to flip on the paid subs for formerly free features.

I can’t remember the word for “prosocial through lowering cost to zero” is but sometimes that too.

Wiktionary:

Benevolent, altruistic, unselfish, beneficent, philanthropic, selfless

Wise customers know this.

Look at how any "FOSS + VC + for-profit" company in the last 5-10 years worked out, and you'll see the playbook.