I'm torn about this because I believe there's an amount of online services that should be truly free, for all, forever

For example, email. I use free emails since the 90s, never paid for it. I went long stretches having no disposable income at all - if I had to pay for email, I would have dropped it multiple times. However email is a postal box in the Internet - people don't stop sending you emails just because you decided that this month, a bag of rice is more valuable than an email subscription

(Nowadays email is like your online identity. People don't send you emails, instead, it's all services you use that send you access codes. Losing your email is truly scary)

On the other hand, I really loved the backup service of Colin Percival, tarsnap. It's an ultracapitalist, even libertarian, and it seemed to me very fair that you would pay for exactly what you use. If you stop paying he deletes your data, on the spot, no questions asked. (actually not sure if there's a grace period for permanent removal. but even if there is, this makes no difference for people that don't have money)

I had to stop paying due to life circumstances, I lost a backup.

I still have backups from around the same time in Google Drive, even without paying anything.

So really if we live under capitalism and such essential services like email and backup MUST be provided by private entities, then we really, really need ads and ad supported business that gives users permanent free stuff.

Fortunately capitalism can't and won't last forever. (but unfortunately it will surely outlast me and you)