My question is: Are there still people who would take a variable loan instead of a fixed loan with the interest rate being really low and even close to zero?
Micro data on lending is often not publicly available but there are empirical papers that examine variable interest rate loans such as variable interest rate mortgages being written as recently as 2019 (e.g. Albertazzi, Fringuellotti & Ongenaso, 2019). Hence clearly people are taking such loans otherwise those papers would be impossible to write.
and why would they do that?
Why not? Mortgage or other loan interest rates could go negative. Some people like to gamble, also any loan has to make sense for a bank, bank will reflect its expectation of what the interest rate will be in the future in the fixed rate it charges.
For example, in the US even despite interest rates being near zero the 30 year fixed interest mortgage interest rate was never below 2.5% (see Fred data). Variable interest rates are usually little bit lower (ex ante) because bank does not need to be compensated for the risk that interest changes. A priori one cannot say that fixed interest rate option is better for consumer than variable interest rate option (one can say that fixed interest rate is more safer option, in a sense that you are being protected against interest rate change risk).
Generally with fixed interest rate option you are purchasing not just the loan but also extra safety of having your interest rate fixed. This extra 'insurance' is not free gift from a bank to consumer, it has to be reflected in the price of their loan in one way or another (e.g. maybe as an extra fee if not in interest rate directly). When it comes to variable interest rate you as a consumer bear the interest rate change risk instead of bank, hence bank does not have to be compensated for this risk but you have to bear the risk.
It is all about risk preference. For example, here in the Netherlands where I live most people have bikes, since its common to bike here everywhere. However, not every person will take bike insurance even though bike theft is not uncommon. Some consumers are very risk averse so they will pay insurance for their bike some consumers are less risk averse or some even risk loving so they never take out insurance and some even get just one lock instead of 2 common here. There is no right answer which of the option is the best one, it all depends on the risk preferences of consumer.