I would like to know if it's possible to create a company specialized in lending to trading platforms (funding on Binance, Bitfinex, Bitmex, etc) and if I would have problems reporting income knowing that interests may vary from 8 to 16% APR and that it depends entirely on the market situation.
You mean to say you want to start a venture capital company with main focus to crypto trading market. It is very much possible but be prepared with few millions at least! For tax, get professional help!
Of course, I'm talking about doing this in crypto-friendly jurisdictions, I'm interested in Estonia since everything can be done online thanks to their e-residency.
Also, do you have other jurisdictions to suggest?
How about Japan? They are most crypto and busines friendly nation in the world!