I would say that the team must be extraordinary rich to be able to pay in USDT Tron or BTC.
Imagine you have a pack of A4 sheets. You take scissors and cut these sheets into little squares - these are your tokens. Right now they cost you nothing. Or you might say its price is $1, or dream and convince people they will cost $5 in 1 year.
Also you have a wallet with lots of $100 bills.
What will you choose to pay for the work? Cut papers pieces or US dollars? If you rich, you can pay in real money. Or you would spend them more wisely and pay with papers, that might cost someday real money.
You are seeing the situation from bounty hunters point of view. But you dont image what will be promotional costs for the project if they pay in USDT o BTC. If they are not limited with funds, they would better run a more professional bounty campaign using google ads, press and etc. Then paying USDT for "click like, retweet button, copy/paste link to forum report post and scream I WORK HARD GIVE ME MY MONEY IT IS ALREADY 2 MIN PAST DUE DATE DISTRIBUTION TIME QUICK-QUICK-QUICK-WHEN-DISTRIBUTION?