A guy posted this over at ADSLguide.org, explains it perfectly of what Enta. are doing.
Enta are not throttling us all to 2Mbit, they are doing stepped throttling in 500Kbit steps until the load is at an acceptable level to prevent packet loss and high latency. The lowest your rate will be set to is 2Mbit, but that is not a static figure, the limit could be anywhere between 2Mbit and your Bras Profile Limit depending exactly on how congested the central is.
Also this will be a per central control, meaning not -everyone- will be throttled, only people on congested pipes, they can also move to a none congested pipe by reconnecting with their router.
They are adding a new segment in 16 days which will relieve some of the strain anyway and mean people's rates are effected even less.
As congestion decreases your rate will be incremented again in 200Kbit steps.
Why the hell ppl are throwing major wobblers over this i do not know, well i probably do actually, its all those that must be downloading porn/games/films/music etc... 24/7, 365, they probably have whole machines just sitting there downloading constantly.
As i said before im still joining them as i think this is a great idea, all these moaning ***** wanna get their arses on to the likes of Tosscali, Eclipse etc... where they shape your p2p to ******* dial up speeds all day, if there kicking off because they may only get 2mb instead of 8mb, then the ***** will be on killing sprees if they were only getting 20k-30k out of an 8mb connection.
Oh yeah Pipex to, forgot about those, see
here, 25k download speed and hes on 2mb, and theres ppl commiting murders on Enta. because they may get a slight drop depending on congestion, dear god what is the world coming to eh.
