I used to use Inoreader, before I switched to self-hosted FreshRSS + fivefilters-full-text-rss-docker. I run both services in a Fedora Server VM on my NAS with Safing Portmaster + SPN for extra privacy. This setup should already hide all ads, but if you want be 100% sure, deploy some DNS filtering solution like Pi-Hole or AdGuard Home so your FreshRSS server won’t even be able to connect to servers that host advertisements. This is the superior way of consuming content on the internet.
Edit: I kinda forgot to mention this, but you can either use the FreshRSS web interface, or connect it to a compatible RSS app like (like the previously mentioned Read You)