S*hit its crazy even only speculation
I think it will not affect the value of bitcoin, because tether also has its own market and is not interrelated between bitcoin and tether.
Thether does not collerate with bitcoin's price, though. It collerates with USD (fiat) and always maintain it's 1:1 ratio. In short, even if USDT disappears, BTC will still maintain its value since it has a comparative value in USD (fiat) and other altcoins (e.g. ETH, BNB, XRP, XLM, etc). However, I do think that any stories about USDT being a threat to BTC are just mere speculations and theories that might be created by BTC non-believers and those who are pissed off of themselves for not buying BTC when it's still 0.01USD. Those people will always be a laughing stock of the crpyto-world (e.g. the man who bought pizzas for few BTCs). There's a lot of conspiracy theories that appeared about BTC, but none of those have stopped BTC in reaching the $40k mark.
it is not affected the price of bitcoin but if the speculation was right and usdt scam its affected bitcoin price but i still hope is just speculation