There's this account nostr:npub1rca2jat8xmuw40t7x7uc2qplaqyu0hc7l2thn5xwfx4pmqpjfa0s29xv4p that posts a lot of these. All of them are basically links to proxies with their prefered protocol (vmess, trojan, ...) that you could decode into a settings object for the respective program.

I don't know why they're being posted, but I assume they are some sort of public proxy one can use. Not something I would trust, but in a chain of hops, it might be useful...?