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is it really necessary for a Bitfinex lending bot to have such a complex setup procedure (server, php, mysql, cronjobs), or is it possible to make a python script for it just like the Poloniex lending bot?
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It is not necesarry, you'll use what you already have. In this case the scripts talking with the API are written in php, this is running on a server, mysql for some stats, cronjobs to run the scripts regularly.
I have personally no clue about Python, but sure, it's possible. Like Sukrim mentioned above something written in Go. The script/programming language used does not matter as long as you can access the API with it.
