What you are describing is basically a PBN. I have been running them for years, so here's the honest take.
cheap new domains + daily posts are not the same as a properly built network. The problem isn't Astro or hosting cost, it's building sites with no real history or value beyond passing links.
What has held up better in my experience is aged domains with genuine topical history, rebuilt as real sites with proper content and development before they are used for outbound SEO.
That costs more time and money.
I do not think cheap version works for people for years. The properly built version can still work, but it's not the $5 and a few posts shortcut it sounds like from the outside.
the hard part isn't building the blogs. it's building sites that can actually stand on their own.