There are plenty signature campaigns which pay via btc. Btc fees are high atm, even when they were low it would take ~1 USD for each individual transfer, why not then just adopt LN?
I don't think the BTC transaction fee was up to $1 for each transaction since the payment is being made using a multi-sender-supported wallet, in which the entire transaction for all receivers is being processed and confirmed all at once. If the fee were calculated individually, it would not be up to $1. Even when I run a single transaction to another wallet, fees are usually below $1, sometimes 0.5, 0.8, and so on. Just a few weeks ago, I started spending up to $1 and above when sending out BTC to another wallet.
I may potentially be ignorant to why LN is not being used, if it's so please throw light on it. Thanks.
LN is good, but not all exchanges support it either for deposit or withdrawal, and I think signature manager's decision to start accepting LN deposit addresses for paymen might definitely kill lots of people's desires and the true definition of adoption since one can no longer spend his or her BTC where and when they want unless on a specific exchange that only supports you to exchange them.