You'd be sadly surprised. There are people that advocate for ebf, even if a baby is visibly starving. I experienced it myself.
My newborn was hospitalised for 10d due to starvation and associated complications as there wasn't enough milk.
I approached the La Leche League for advice and was told they couldn't under any circumstances 'condone' formula use (even after I explained I was triple feeding and my baby had come very close to brain damage from starvation) as it would increase my baby's chances of cancer, so if I wanted their support I needed to commit to throwing out the formula and ebf. Even though medically speaking, I couldn't sustain his life.
I've also witnessed first hand in feeding groups new mums posting a clearly listless, skinny and poorly baby, expressing they're worried they're not making enough for their baby, and being told to just trust their body and keep going. Avoid formula at all costs. Any voice of reason saying just please give your baby a bottle, you can sort out bf after if possible, but your baby needs feeding immediately, is shouted down as scaremongering.
It's terrifying. I've seen new mums also themselves decline medical advice to give their baby formula as they've become so fixated on 'never a drop' they can't see sense anymore. I was involved with one case where social services had to become involved because the parents were denying anyone seeing their baby to assess after midwives raised the alarm, and continued to fruitlessly ebf.
I'm not having a go btw, and there will be people on this thread that claim these instances are vanishingly rare and everyone can bf with the right support, I'm just sharing that there sadly is a very dark side to infant feeding groups and 'advocates' that genuinely sees formula as a fate worse than death for a baby. And the new parents that refuse to give their baby formula when they're failing to thrive, I don't blame them. After months of having 'breast is best' hammered into your brain, people saying trust your body, everyone can bf with the right support, it's supply and demand, don't keep formula in as you might use it during a 'weak moment', why feed your baby mcdonalds when you could feed them a gourmet meal, mum's milk is best, and so forth... it's no wonder new mums put such a disproportionate amount of pressure on themselves and end up risking their baby's life. It's tragic.