Teens aren't likely to independently book dive trips, and a lot of people don't live close to local oceanic diving. Quarries and lakes alone won't cut it for most. Parents may pay for those things you listed (to be fair, phones are part of the social functional platform in modern society, computers and the Internet likewise plus a lot of work, including school works, is done on them), but they're not likely to send their minor out of the country to dive in 'shark-infested' waters - and they won't get certified to go with him, either.
Who the hell is talking about booking dive trips? The idea is to get someone interested; not bribe them with the empty promise of a f**king Corona ad. You take a course (as I did, at the Y, on my dime); swim in whatever body of water is available to you (as many friends did, in lakes and quarries -- even water traps). I was diving for five or six years before I ever had a chance to swim in waters above 10˚ C; that didn't deter my interest one whit -- nor those of my friends. I still prefer cold water diving.
The immediate attraction was the newly-realized ability and promise of breathing underwater. No small feat. It didn't f**king matter where you were. I was in an overly-chlorinated pool in the late 1970s; and that memory is as clear as day.
Got my first new gear, as a teenage prep cook, at minimum wage -- again, on my dime; wasn't waiting for my parents; nor did I feel that all-too contemporary, millennial conceit of entitlement . . .
Sure, parents may cover many or most of a kid's expenses; but schoolwork can also be completed on a 300.00 Chromebook, just as effectively as on a 2K MacBook Pro, while sporting 300.00 sneakers, and yup-scale Bose noise-cancelling earphones . . .