What is an "offer" if your business is all self-serve online with no one-on-one sales?

I thought I understood what an offer was until I heard Brooke say “it’s not an offer unless you actually hear back a no. It’s an offer, not an announcement”

Yet at the same time she said she was “making an offer” on the webinar, but she wasn’t actually hearing back a no.

My business like SCS is online and people sign up on their own without a one-on-one sales interaction.

I thought my “offer” was making an explicit offer via my website or email, although people don’t actually write back “no”.

So is sending an email with an offer that people do not write back to still an offer? I would think the silence would count as a no, am I understanding it correctly?