"Your fretboard does not need to be oiled or moisturized."
Pardon, please, but I strongly disagree. I have seen fretboards so dried out that the fret ends literally stuck out, and one uke even popped a couple of frets out.
I use fretboard butter (never oil) every time I change strings. It gives it a wonderful feel, and my fingers glide over the frets more easily.
Try it!
I think we may be having a semantics or wording disagreement rather than an actual disagreement.
Frets popping up or sprouting out the sides of the fretboard are from a loss of water. The way to solve that is with water (humidity control). Excess oil can actually make fret issues worse - and it definitely make it much more difficult to properly repair a damaged (loose, or sprouting) fret. Keeping a fretboard in the right humidity range will prevent fret sprout or other moisture-loss related damage regardless of the finish or oil put on the fretboard. Humidity control is the only way to truly solve fretboard moisture issues and hence fret sprout.
Oil-based products and "moisturizing" products can look and feel nice but they can also lead to problems when they build up in the wood over time to the point that it won't take repair work well (i.e. it's difficult to get a popped fret to stay put in an oiled board, and the oil also prevents CA or other glues from sticking). I've had instruments come in where the owners were using conditioners or oils that caused issues with frets, binding, or even the fretboard itself - something that should be a simple repair quickly turns into replacing the entire fretboard. That's a difficult conversation to have about someone's cherished instrument, especially when they're convinced that they've been doing the right thing by putting products on the wood.
If you like the look or feel of a freshly oiled fretboard, the best approach is to just use an actual drying finish, not a non-drying oil. Pretty much all conditioners/butters/oils sold for fretboard use are mineral oil with different scents or other oils or waxes mixed in. There are a few products sold that are built on drying oils. Those products cure to an actual solid finish, but retain the look and feel of a freshly oiled board. You apply them once and you're done for life. Stewmac's Fretboard Finishing Oil is my favorite, and what I use on all the instruments I build with dark wood fretboards (rosewood, ebony, etc).
I'm not here to start an argument or tell anyone they're wrong, but rather I'm just to provide my perspective based on building and repairing instruments for a little more than two decades. Oils or oil based products can look and feel awesome, but they can cause problems, and they don't actually solve any problems. If you have frets sprouting or popping out, it's not because of a lack of oil or any other product - and oil based products can make those problems worse. Focus on good humidity control and you won't have frets sprouting out, that's the simple truth. If you really like the look and feel of an oiled board, just use a drying oil finish. If you're convinced you need to use another product, use it as sparingly as possible. Fret Butter is probably the best (or, least-bad) of this type of product just because it's inherently sparing in terms of how it applies to the fretboard - you don't end up with much product on the fretboard at all. But at the end of the day, if you have a problem with the wood drying out, ultimately, it should be solved by storing the instrument at the proper humidity.