When you create a free blog on blogger definitely your blog starts in using a subdomain which is automatically has HTTPS enable but after you bought a custom domain and linked it to your blogger blog as default your domain will only be having HTTP. It's because the domain registrar also sells SSL Certificate that turns your domain name automatically to HTTPS upon purchasing SSL Certificate which is a little bit expensive to some countries. Thankfully blogger has their own HTTPS Free availability for blogger user.
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Why You Should Turn Your Blogger Blog To HTTPS
The Advantages of HTTPS
How To Enable HTTPS in Blogger For FREE
Hope this post was helpful to you, if you have any doubt on this page, feel free to comment below and I will be glad to give you a response. Thank you for having time reading on my page and good luck to you!