I'm also for free the spins all the way. There is something powerful in the word "free" it's like the word "sale" when shopping. Free spin sis all worth it to take a risk. You can play it for free without spending a centavo, but I do believe it's something strategy. They won't doing it without advantage/s. They will offer free spins and when they caught our attention people tend to play it again and again. They earning by that strategy but our chances of winning is also getting bigger.
For me it's more on the value of the free spins rather than the word because some slot games really have a good free spin mechanics where you're allowed to get some re-triggers and substitute a wild symbol. There's also a game that lets you give another chance to trigger the feature whenever you get two of those scatter symbols the possibilities are endless that's why a lot of people prefer this feature.
Nothing in the world is free. These free spins are paid by you in a different way, this is a typical bonus that is given to you at your own expense.
Yup, they're more like premium spins than free since they usually have an extra bonus (boosted multipliers, extra reels, extra wilds, etc) that could potentially boost your winnings.