What is the best wallet for Monero these days?

I´m using Ubuntu 21.10 if that is relevant.

Is the new bill really motivated by the wish to close existing tax loopholes? I highly doubt that!

I´d argue that they have been pressured by the IMF to crackdown on crypto.

I don´t think that they will reject the deposit. At most exchanges cryptocurrency deposits are fully automated.
Therefore the funds will be credited to your exchange account even if they are tainted.

It is more likely that the account will get frozen after the deposit or they will at least ask you
to prove that you obtained the cryptocurrency from a legitimate source.

The Federal Reserve is probably going to do another rate hike in June.
Higher interest rates are bad for crypto - and bad for all other risk assets.

Until the major central banks return to a loose monetary policy we will not see a considerable higher BTC price.