USDT's price against Telegram Stars has moved with the broader crypto market — this page gives context, not a live quote (see the current rate page for that).
Card payers never have to think about price trends at all — a trade-off some buyers actively prefer, even if USDT ends up cheaper on average.
Anyone who already tracks USDT's price closely won't find anything new here — this page is aimed at buyers checking for the first time.
It depends on the comparison — USDT isn't a stablecoin, so its price does move, generally in line with the broader crypto market.
Volatility varies over time; the trend on this page gives a general sense without pinning down exact numbers that go stale quickly.