EDIT: Just to be transparent I saw that a company called BitPost already is doing something like this, but they are not opensource and they are selling a token, I want to reinstate that I just want to gather thoughts on if it can be feasible (considering network fees and consequently costs to post an announcement on blockchain / L2, lock money on a contract, verifying package legitimacy ecc...)
And they had a huge premined tokens on their new forked and centralized blockchain.
I don't like the idea of using some obscure network for this, but I also think that Bitcoin mainnet would not be ideal, because it can it is transparent and it can be slow.
Using some layer2 solution would be acceptable and even better if that has private or confidential transactions (like Liquid Network).