Honestly not a bad idea. Apollo has such a dedicated fanbase that if you get them to adopt a new community, then the quality of posts will start out pretty high. So much of Reddit is crap anyway so drop in quantity from lack of network effect wouldn’t be such a bad thing. Focus on Apollo’s strengths: great UX and bring it to the web.
Ofc the major issue is how to avoid enshittification. Having a good monetization strategy from the start is key. Hardest part besides attracting large user count is to attack some of Reddit’s failings: terrible arbitrary moderation. That’s the tricky part.