Earlier quoted context omitted.
Seconding IBKR. I've always viewed them as the most ethical broker and also the one with the highest skill ceiling. They do not sell order flow, they offer programs like the above so you can earn interest when they loan your shares out to other individuals or institutions, and let you get very granular about things like your exchange routing.
You should watch their CEO Thomas Peterffy's interview during the gamestop situation - he basically said "shorting is illegal" and a lot of other such nonsense .. completely lost respect for IB after that, even though I still maintain an account. https://streamable.com/ycdec9
And Thomas responds: "No, no, no, not correct. So, so short squeezes are illegal. ..."