It is as bad as gambling if not worse, you don’t even know what you are buying.
To be fair, booster packs are designed primarily to be used to play in limited formats like draft or constructed. People buying boosters to try and pull expensive cards are doing themselves a disservice by not just buying or trading for the singles they want.
Matrix has the unfortunate problem right now where all the big clients have matrix.org set as the default homeserver. Yes, it is a decentralized and federated protocol, but I wonder how many users are registered on matrix.org vs other servers.