Some social workers are very "old school" and still talk about settling in allowances and adoption allowances, but really those days are long gone.
Funnily enough, I had both and still have an adoption allowance - we didn’t ask for it, it was offered because it came attached to the kids. It recognised the significant support they would need on an ongoing basis. We also got a settling in allowance in recognition of the cost of going from no children to two children well beyond the cot and buggy stage.
We had budgeted to have children, could afford to do the travel and prepare the house etc so it wasn’t essential to the adoption going ahead but has made a huge difference to the choices we’ve been able to make in caring for our children.
Many new parents have help from friends and relatives with a new baby, help buying the pram or cot, folk buy them gifts, hold a baby shower etc. This doesn’t happen in the same way for adoptive parents. Birth parents also don’t have legal fees to pay (in our case seriously expensive), they don’t need repeated assessments, approval panel, matching panel etc and often need to take time off work to do these at times unpaid. They also don’t get 9 months notice that their child will arrive - we had around 6 weeks to get everything in place which was fine but a lot of expense all at once. They may know “a” child will be coming but they done know age or sex or even what they’ll need to buy and what the child already has.
I think you’re being really mean minded here - I didn’t demand to be paid to meet my children for introductions, but the money came in very handy at a stressful time. Not to mention the small fortune the local authority has saved having my kids out of foster care.
If you’re a social worker and really can’t understand that a bit of financial help can ease the way at a very emotional, stressful, anxiety provoking time, I wonder about where your empathy has gone.