The rest just walk into a friendly-looking dive shop, sign up, and hope to get it over with.
Reasonable. Now I'm curious. I've never really thought about asking the people I meet at my two LDS how they found the shop or chose it over other options. I'm going to start asking!
But, I have to say in advance that I will be surprised if there are many who didn't ask around at all and also only went into the one shop.
If someone chooses a shop without asking around at all, and also without going into any other shops, then they would clearly have no chance of being influenced at all by any tech divers. But, for all the rest, it seems like there would at least be a chance that word of mouth might influence them, or seeing two shops and one looking like it takes diving more seriously or offers things from tropical OW-friendly all the way up to higher levels or are patronized by more experienced divers might influence them.
Of course, if the shop looks too "techy", that might actually be intimidating and put some prospects off. I'm sure there is a very fine line there.