In the case of Twitter, the new owner has thoroughly broken the advertising business and is trying to aggressively pursue a new version of the data business Twitter once had-- E.g. Google's Caffeine, which Twitter also eventually lost https://searchengineland.com/google-search-algorithm-change-... ... The statements about "too many scrapers" are almost certainly as illegitimate as the previous pre-acquisition statements about "too many bots."
The nature of business is that there's no judiciary or referee... the purpose of a business is to make money. Tech businesses just happen to hire lots of academically-oriented engineers who developed their skills in a different environment. It's possible to build a culture of "fairness" in a business, but at the end of the day even Google dropped "don't be evil."