lol…small sums are easy to come by at local meetups. Large sums will be tricky; for large sums best to buy KYC…if you need to recover privacy, worry about that after purchase and before spending.

An advantage to using KYC exchange is having a source for documentation to generate tax paperwork / permit you to write off purchase price if/when you sell. For the foreseeable future, you might do well to take tax neutral actions like not realizing a gain (borrow against bitcoin if you need dollars or whatever, but work hard to avoid selling bitcoin).

The most efficient one you can afford. S19kpro is the sweet spot for me right now. Jpro still good but definitely gotta give jpro a job sitting around just hashing all day ain't gonna pay the power bill... While antminers tend to require more servicing and attention, they have much more flexibility than whatsminers in almost every way. If you have cheap power and can just let a miner hash away without using the heat. Whatsminers might be worth the extra cost.