I'm going to put the severity of this into perspective for you.
When you join the server your first task it to make money by any means necessary, within the rules of course. You start off with nearly nothing and work your way up, leveling, upgrading, buying, selling and occasionally gambling skills, items and money, the last part with the exception of skills, you don't gamble skills.
The intended way to do this is to start working as a paramedic, firefighter, roadcrew or courier. If you feel really brave you can tackle police head on and learn it as fast as you can. The second primary way is drugs, very risky. You're essentially putting all your eggs in one basket when you do this and you just hope you succeed or you'll be back at square one and have to apply for a job. It's not that bad, it just means you're set back a few hours. Once you succeed it's rinse and repeat for a few weeks until you have the millions you want. This takes time, and doing this without premium will force you to spend nearly double the amount of time than if you donated to the server for premium, practically doubling your income once you do.
Of course, all that takes time so let's imagine all that work, and you just allow a shortcut on the side of that where you can just fast-track everything because you were fortunate enough to have loads of money IRL that you can just dump into the game and buy IG cash from another guy looking to make a quick profit. A new player with two hours playtime will have a bugatti, a lambo and hundreds of rifles in the most severe cases and end up with no desire to donate to the server itself because the benefits do not outweigh the ones that come with buying money from another player.
If 2.4 never existed then a majority of people who have disposable income will donate to other players on the server. This is a terrible thing, because the server NEEDS donations to keep running, you're not contributing anything to the community but for your own gain and is an extremely shortsighted way of looking at it. What'll most likely happen is the server will eventually eat shit because the income from donations that usually keep it up just vanishes. Sure there'll be some people who want to donate to keep the server running but it's not sustainable in the long run.
You would never need premium because you don't ever grow drugs because you bought your money. You'll never need a physgun because there's no reason to build a base to grow drugs. You won't ever need to donate more than once to get access to premium vehicles for the time you need to buy the car you want. So why donate more than once if at all?
Without 2.4 and In the cases where premium becomes useful for basing, you're creating a playground for people who join the server every day to grow drugs, sell the drugs, then sell the IG money they made for IRL funds.
It's pretty obvious why the bans are so long, you're not supporting the server in any way if you break 2.4. Like
@Misel said, you'd have received a permanent ban back in 2014 and in most cases with no chance of appeal IIRC.