This seems to be written by the CEO of a company that provides the exact service the article describes. That doesn't necessarily invalidate it, but I'd read it more as a business pitch than an honest, unbiased opinion.
You're being generous. Thinly veiled as a blog post advertising is such a common thing and so so transparent. I wouldn't treat this any differently than a banner ad on a website.
Google itself tried to validate the idea but ended up shutting it down in 2015. Google Helpouts used Google Hangouts to connect people with experts. If someone could make it a two-way street, and use credits instead of cash, it could become a time bank, which is what I'd really like to see proliferate.