did Tether increase the price of bitcoin? maybe contributed to it but i'd say the contribution was less than 5%
will bitcoin fall if Tether collapses? yes because of two things: 1. this FUD got too big. 2. Tether fall equals bitfinex fall and being a big exchange can cause a big drop in bitcoin price like when it got hacked and price fell 30%. but i don't expect more than 1 month of downtime.
Depends on how big Tether market is.
Every single person who sold their BTC for USDT basically did not sell.
Their selling pressure was negated by these fakely printed USDT that are not backed by $1.
So, it was phantom BTC buying power. Inflated the price.
If USDT collapses, it won't directly affect. You just lose your USDT.
Has no effect on BTC, except sentiment, which can affect price.