Aren't Google and many others looking at it too? Also DNS-over-TLS is also being looked at by Cloudflare, Quad9 and more. I don't see why Mozilla is being called out here.
Most major public (non-ISP) DNS resolvers support DNS-over-TLS today. (This includes Google, Cloudflare and Quad9.) The problem for the ISP is that switching to those resolvers would mean users would no longer use their DNS resolvers. I guess they're selling the data and that's why they're so mad about it. Mozilla is AFAIK the first one to include support for it in a browser. Chrome doesn't support it yet but will do so soon.