This is not new phenomenon, it's called Tragedy of the commons. You obviously could make them all payable, but then ppl would just use the "free" alternative (Twitter) nostr:nevent1qqsxpd54sh4qeryffzanmapu7u8pe3euzy4v33sunvrts2ytq9hdpksppemhxue69uhkummn9ekx7mp0qgs8eseg5zxak2hal8umuaa7laxgxjyll9uhyxp86c522shn9gj8crsrqsqqqqqpfrqd6m