None of these commenters actually use OnlyFans, because there's literally a free tier option to subscribe. You still need a credit card to sign up because they obviously want to reduce the friction for subscribing or paying for extra content. I've seen a lot of models that will use Twitter > Free OF > Paid OF funnel. Twitter is mostly soft-core / flirty, Free OF has some nudity, typically no videos, and the Paid OF is where most of explicit content is.

Revenue wise, you'll make a lot more money tailoring content to a small group of users who will pay for custom content / live cams etc than having any mass appeal with small donations. The large social media funnel is mostly there to get model's content out there to find the whales.

Context: I have a side business deploying chat LLMs for OnlyFans models for fans to "talk" to that's currently at 65k/MRR. It definitely helps with user retention, as models who chat to their fans will have a 2x or 3x spend rate per fan.