What is your say on Tags/Hashtags for targeting multiple keywords?

I found a blog page on a site that still uses tags and hashtags for targeting multiple keywords - "tellinga[dot]com/post/63-birthday-card-ideas-fun-cards-for-birthdays" (scroll till the end to see those).

I personally found it to be a very old and outdated tactic. But I am in a dilemma here about the negative and positive effects. So I ask you, what's more important here - Crawl Budget or Internal Linking? Because it will clearly create thousands of extra pages, which will consume the crawl budget, yet the internal linking may strengthen. Thus, it definitely has its pros and cons.

Now, what's your say on this? And how do you think Google reacts to this?