To start, I dont think Hive is on the radar of any major player. Hive is doing well but we need to keep it in context. I can guarantee Facebook, Twitter, and YouTube are not even aware that Hive exists. Hell a majority of the crypto community doesnt even know what Hive is.
As for the patents, how are you going to go after a blockchain. What can they patent?
How do you sue something that is decentralized?
Possible trademark infrigement is one example.
https://www.cryptonewsz.com/oracle-sues-blockchain-startup-for-trademark-infringement/37358/
Other examples may include liability, intellectual property and data protection.
https://www.dlapiper.com/en/us/insights/publications/2017/06/blockchain-background-challenges-legal-issues/
And finally, does one's digitial assets qualify as a security?
https://www.coindesk.com/investors-suing-ripple-cite-sec-guidance-to-argue-xrp-is-a-security
These examples could apply to the blockchain's parent orginization or to those maintaining and managining it.