This isn't really true, it means "capture the fascinated attention of". A child could be enthralled by a jigsaw puzzle. You could argue that their attention has somehow been enslaved, but I can't recall ever hearing or reading any phrasing quite like it.

"to hold in or reduce to slavery"

https://www.merriam-webster.com/dictionary/enthrall

Context matters. If you are talking about a child with a jigsaw then sure, the more cutesy definition applies. But talking about politicians and money, you have to bend over backwards pretty far not to see the second definition as more appropriate.