I'd argue that youtuber's who use airsoft as a job/source of income are professionals, perhaps not in skill but if they're making a living off of it then that's good enough to count as being a professional imo.
I could imagine there's a few site owners in history who considered to invite one of the well known youtube airsofters to their site for a potential promotion video work.
If that ever happened, that could be considered as sort of an airsofter/videomaker who received some form of compensation for playing a day worth of creative airsoft after all. Hypothetically.
So yeah some airsoft gameplay related work could appear here and there but it's not a profession so the term professional airsofter is incorrect this way. I'm just wondering if there's any professional paintballers out there? Is that a thing?
In regards to sport those American speed-soft CQB guys consider it sport, they have spectators, pretty sure they win prize money and get sponsors and such, sounds like sport to me.
Definitions are definitions and you my friend by definition are a pro.
They get paid a pot and sponsors give them stuff they would otherwise pay money for as well as affiliate schemes for sales via their discount codes and they create other revenue streams from streaming, blogging, twitch etc etc just like so called pro video gamers.
The joy of language is that you can so-call something until accepted usage changes.
However, I'd stick to the position that if you're not paying your mortgage and utility bills from the income from a hobby, then it's not a "profession". Banks and gas companies don't accept patches as payment.