Binance is China-owned so there's no problems, all criminal allegations are false, company is in great shape, and customer's assets are safe. What about Coinbase?
That may be so, but in normal communications, such as speech it is tone of voice and possibly non-verbal hints that will indicate sarcasm. Online you don't have that and the 'collateral damage' can result in a lot of wasted bits from people reacting to the words rather than to the joke and this in turn can drown out the rest of the discussion.
It happens :) The first few years on HN I was super bad at this, but after a while it becomes a bit easier and the posters history is usually a good clue. That said I still get it wrong plenty of times, especially in writing.