Absolutely.
The most successful young marketing / PR grads I know started and built successful social accounts during their sixth form and uni years, which meant that when they decided they wanted to work in the marketing / ad industry they had demonstrable skills in the industry that gave them a head start on other graduates.
Influencers develop key skills (marketing, videography, editing, brand liaison, organisation, budgeting etc) that can be used in careers outside of their own pages.
It shows someone is a self starter, too. It requires initiative and ongoing learning as social platforms evolve so frequently.
I can only assume the comments saying there's no skill involved / it's nothing to be proud of are down to ignorance or snobbery.