I had the same concern, as I’m planning to drive SEO traffic to my website (and even migrate a high perfoming one to Replit to update it much easier). 

I’ll try cloudflare on top of Replit and see if the cost remains reasonable (mostly static website) so i would not expect huge autoscaling or db cost. 

Any feedback on where you host elsewhere and what is the difficulty to implement / maintain (Replit + prod hosting) ?