"Some guy was asking me whether he should add every transaction that he made in the exchange or just the end result."
Technically, every transaction is a taxable event with a different cost basis, and fees to be deducted.
It's literally too onerous to even be complied with.
Yes. Exactly. Just think of all those bots doing 100k tx's a day. No tax software to calculate. It's like expecting you to read the entire contents of the Library of Congress by April 15th. Simply impossible to be in compliance.