I really have a big question between the settlement of USDT TRC20 and Monero. I feel that using USDT is still stable and better than XMR, since the price is not volatile and transactions always have fee of 0.
USDT - TRC20 has great block handling speed and in addition it is fee free in transactions. As for using XMR, we run the risk of having to sell off after buying or incurring high transaction fees. So why should we choose XMR and celebrate it like that? Does a privacy coin have a special function than Tether?

Well, privacy really matters in cryptocurrencies and especially people who want to get subscriptions for porn-related services will have privacy as more priority over the transaction fees. Even bitcoin is not completely anonymous so that is the reason having Moenro like privacy coin is more welcomed by the pornhub users.
Tron-based USDT is actually faster with no fees but tether is completely centralized so it's like banks know that for what you are actually using those funds which most people don't want to happen.