Who stipulates that Bitcoin must only for finance?
Satoshi did. According to him, Bitcoin is a P2P
electronic cash system. It allows for
online payments of electronic cash to be sent from one party to the other without intermediaries. So, it's not a network to save your social data on or a blockchain to create a
de-social network. If you don't believe me, check out what it says in the
whitepaper.
If we use Satoshi's words as argument, we probably should use his comment about BitDNS project as well[1].
Is what you offer something like Bitrated, Bitcoin Trust - multi-signature smart contracts for buyer protection and fraud prevention for Bitcoin
[1]I remember the service was popular in the past and you could link your account to the forum, Twitter account, additional data about you and they would give you a number, the higher your number the more trustworthy you are.
In general without giving guarantees that the service will be decentralized and the development team cannot enhance the value of accounts (especially paid ones) then it might be a good thing.
[1]
https://bitcoinmagazine.com/business/bitrated-unveils-reputation-system-multisig-escrow-1424750534Briefly comparing Bitrated with BitSoul's protocol[2], IMO they are different. BitSoul doesn't offer multi-sig escrow and doesn't use centralized social media.
[1]
https://bitcointalk.org/index.php?topic=1790.msg28696#msg28696[2]
https://github.com/bit-soul/brc-soul