There's a bit of confusion on this thread between 2 types of trust.
Some companies sell lifetime trusts, and persuade their clients to put all of their assets into this type of trust with a promise that the LA can't force payment of care fees. This is legally very dodgy ground, and the two biggest firms which sold these trusts (at very high charges) have gone bust, leaving a lot of clients in a mess.
There is absolutely no guarantee that the LA won't successfully challenge a lifetime trust set up in a way which was clearly meant to avoid care fees.
The other type is a Life Interest in Possession trust; this is set up within a will, and only takes effect on the first death. Because this type of trust only ringfences the first, deceased, spouse's share of the house, if the survivor goes into care, they do of course have to pay for that out of their share of the house, but the first-to-die's share is held by the trustees, so although it can only protect half of the value of the house, for many clients, it's worth doing.
TLDR:
Lifetime Trusts=Potential scam, don't do it.
Life Interest in Possession Trust, (aka Flexible LIT, Property Protection Trust, Immediate Post Death Trust) = sensible for many clients, depending on circs inc what other assets are available.