1) I think Elon Musk's angle on Twitter spam is rather different than ours. Look at replies under his tweets. 2) I am not an ML engineer, but still a software

1) I think Elon Musk's angle on Twitter spam is rather different than ours. Look at replies under his tweets. 2) I am not an ML engineer, but still a software engineer and in my opinion the problem of self driving cars is at least two orders of magnitude harder than the problem of Internet spam. Maybe even three orders of magnitude. 3) We actually know that the problem of spam is successfuly solved by Google. When was the last time you saw a spam message in Gmail? I am seeing them in my inbox approximately once a month. There are about 8 messages in my spam folder per day, so it is about 0.4% false negatives. This is a great result. 4) Social networks are not interested in fighting spam. It just will make their metrics worse. All they need is to keep it at moderately acceptable level, so users won't flee in bunches.