Having a blog as backup to insta and TT?

Hi all. I’m a complete newbie to all this stuff. My dream is to start a home decor/design insta and TT to share decor ideas and share products that I like for a commission. However, if I ever get to a place where I have a substantial amount of followers, then I’m at the mercy of the Instagram and TikTok apps. If they ever shut down, or a hater reports me for a bs reason, or whatever, then all of my hard work and cash flow could go away.

This is what makes me think I need to have all of the info that I’m sharing to insta and TT on a blog (probably created on WIX) in which the domain is mine and I have complete control.

Question is, why would a follower ever go to my blog when they get all the same info from my insta and TT? Especially if they will be spammed with emails if they join a blog?