Do all people in the UK who have jumped bail get treated this way?
I believe he's been in a high security prison for some time now, is that to protect him or to ensure he does not do a runner again?
The amount of UK taxpayers wasted on this person is ridiculous.
I suspect that if you're a high flight risk and have jumped bail previoulsy, then yes you would be held in prison until everything was sorted.
Given he's hidden himself away in a foreign embassy claiming asylum for years, and has some very wealthy friends who own or have access to things like private aircraft and boats, then I suspect there isn't anyone in the UK justice system classed as at a higher flight risk.
As for money wasted on him, that's not the government's fault, they have a duty to enforce the law without fear or favour, and when you have someone show such contempt of it, and break the terms of his bail as Assange did, then you don't really have much choice but to keep going after him until he's been dealt with fully by the courts otherwise you're telling people that all they have to do to avoid the legal consequences of their actions is to stay hidden or out of reach of the law for a few years*.
Fortunately there aren't many cases where a bail jumper costs the government anything like as much money.
*Ronnie Biggs for example was "on the run" for over 30 years, and when did finally see the long arm of the law again he had to finish his original sentence.