Why do so many subs ghost?

I'm relatively new to the BSDM world but have had a couple IRL dynamics with subs that I've enjoyed. I enjoy being a Dom and I think I'm decent at it. I've had subs reach out to me through social media because I am a content creator and occasionally discuss my integration into BDSM. However, they almost always pledge their loyalty to me and then ghost. Maybe because they get scared or there's a financial component? I don't understand the constant ghosting instead of just stating limits. And I'm a pretty soft Dom all things considered - I don't say anything egregiously crazy to them.

Any advice?