Hi Fyrre, good to know you're back in l2 (or just visiting), this community needs people like you!
I'm not a programmer on such level, but I'm very into the politics behind it.
Let's say, AA (the only driver based protection atm) is a company in Belarus, a real company with all the docs and stuff, they're basically a group of programmers that made a driver protection for AION, about 1.5 year ago, they decided to move to L2, basically their "driver" solution sounds like a real hit at the time, but they knew nothing about l2 therefore their clientele remains very limited. I won't tell why, because I don't wanna give tips to competitors =)
Now as I read above, players and majority admins don't read anything about security, they don't know how this stuff works, and to be honest I didn't know much about protection world before we started our protection campaign, because smart was very expensive and asked about 900$ to upgrade 1 client to new chronicle and extorted 500-600$ per license for our classic clients. So when somebody hears about "driver based protection" it seems that they lose their mind and think that no bot will work there. Now that's a good move for smart guard who's constantly trying to make people forget about what they've learnt at the beginning of this year. for example let's say this:
Akumu few weeks ago:(google translation) We update the protection weekly, most often before the weekend, and as practice shows, the Adrenaline bot on average takes a long time to bypass the new restrictive measures.
If you say that we are not taking any action - you are either mistaken or misleading others. On our website there is a complete statistics on the bot detection, there are clearly visible waves of detects and bans.
Yet we all know its bullshit, he keeps doing "business as usual" with the same business template as before, why's that? because instead of fighting adrenalin, he became his best friend, what leads to 2 years of 0 doing with an exception of 1 new bot over few years, making him and adrenalin the only solution at the market. So let's say he will do a good job with his new driver module, would something change for adrenalin? ofc not, that's the total bullshit, he has 0 experience and he will never cross his friend, cause he'll be out of the market faster than a bullet. It will just give more credability and they will try to restore the "old world order" in which both smart and pcoder are the only solution to everything, which can lead to incredible incomes.
Now he knows that continue marketing within the +- same protection circle won't bring him back the same gross income like before, cause we have strix, sguard, aa and even ex-guard has its clientele, something that wasn't here just a year ago. So with regards his cake has been cut atleast 50% and he's very stubborn he will jump to driver burring down all his work since 2012-13 , why? its simple, people think driver is their best solution against adrenalin and other less popular bots and he wants "his" money back with a "brand new solution". Does he has a vision? I doubt it, there's a reason why AA is driver from day 0 and everybody else is not and make no such plans, its all about marketing trick.
Now, driver based solutions distributed widely have to be properly attended, when you lay down on 1 person company to maintain thousands of people, you may be at risk, probably you will be at risk, because he has no liability over the damage he may do to you. Now this part is true about any kind of service givers, yet, there's a definitive reason why we prefer NOT to go to driver, one of the main reason, that we lack of personnel and won't be able to maintain as it should be maintained. But hey, when you lose money, you can lose your head to restore it all.
So at the end, your question "why" is ended with the same old answer - money.