in no particular order:

a. their freedom of speech is largely limited;

b. their freedom of movement is almost non-existant;

c. they do not have the right to own property;

d. parents have an immense power over them, with zero oversight in most cases, in a manner analogue to egypt pharaoh's or something (also, like pharaohs, they claim the children are THEIR PROPERTY, just like slaves in commerce);

e. they are ridicularized and treated as incapable a lot of times and get harshly criticized while adult society is a clear disaster;

f. they get their creativity and will to live supressed, repressed;

g. they are coerced into taking part in school brainwashing, a lot of times having more responsabilities than their parents;

h. they don't get paid for their work;

i. the child can escape from the cancer of nuclear family, but in most cases if they choose to do so they will end up in even worst swamps;

j. children get lied to, tricked and manipulated all the time;

k. beyond being denied the freedom of speech, a lot of times they are more deeply denied the broad freedom of thought, being forced into some religious brainfuc* of some sort;

l. not to mention all direct abuse like free labor, physical and/or verbal abuse, all kinds of prejudice, etc;

m. marginalized everywhere by cities, places and adults that ain't safe or fun;

etc

"All that which might be destroyed should be destroyed, in order to free children from slavery" A saying from an old revolutionary.