All fair points. I can't really "spam" like crazy since I'm limited to the amount of bitcoin I'm willing to zap, I can't just print it like a shitcoin, and I'm also limited to the amount of people even interested in sending a message.
I am convincing them as well.
What I'm doing is more of a double publicity thing, those who send a message might actually feel compelled to hire the service. On the other hand, the business secretary and owner may feel compelled to study this bitcoin thing everyone is suddenly asking about.
I get along well with the whole team, so if they found out I offered zaps to people to message them, I wouldn't be too worried.
I'm no marketing genius and I'm just experimenting, so this could all just be a waste of time and sats. I don't see the shitcoining, since it's all bitcoin only, the secretary receiving messages is doing his job at the end of the day, those messaging might actually find what we do interesting + they receive 100 sats and the business may get more curious about btc than it already is. But that's my take.