If they make it affordable enough for high-traffic non-profit websites to use on a whim, they will be leaving a lot of money on the table from web businesses who do actually make money – and those businesses are actually the best customers for their SaaS – willing to pay more money for less traffic.

I'm also not using them for my casual projects because I can't afford their cloud service, and I can't be bothered to self host, but they'll be totally fine without me.