Britney can't be trusted alone. But realistically, nobody actually around Britney can truly be trusted with her either, all of them seem to have money as at least one of their motives for trying to 'help' her.
And the professionals who can actually be trusted with Britney, are not people who Britney will trust because of how the conservatorship was run in the past. It was too restrictive during her 'well' periods - when she was well enough to be actively seeing her children, she should have been allowed to have a coffee, or use her own credit card for purchases under a realistic limit and actually utilise the money she was earning. But because it encroached too far, I don't think she'll ever willingly engage with professionals again.
And I think Britney also knows the line of what she can get away with. She likely knows that if she's out spinning nude in a public area, she'll be detained. She likely knows that if she assaults someone while she's high then she's going to be arrested. So she'll just not do those things, because if she doesn't cross that line nobody can force her to get any kind of treatment. And she can continue doing as she pleases - she's already lost her kids, her husband allegedly doesn't give a shit, she's not involved with her family, so realistically what is there for her to lose?
It's a massive shame.