I don’t know how long or well it’ll work, but so far I was able to evade the initial “no URL shortener” Reddit filtering with it.
But for reasons I ended up paying for a month of a Pro plan on a URL shortening service to only find out I didn’t need to for what I needed, so now I’ve got a limit of like 1k links on a custom domain LMAO
So if it’ll help, DM me a comm you want a “cloaked” link to to spread around on Reddit and I’ll send you a link on a custom fresh domain you can throw around
I’m not familiar with the reddit filtering but have you tried using cloudflare page rules? You can try capturing everything after the .tld and then forward it to a lemmy server. So for instance somedomain.tld/12345 could forward to lemmy.world/post/12345. If reddit is checking links for 301 redirects to lemmy though then that wouldn’t work.
A more advanced approach would be to use a cloudflare worker to do a proxy response so the status code is returned as 200 OK instead of 301 redirect. I haven’t tried that but i think that would be much harder for them to block and you could always make more elaborate urls to make it harder to find obvious lemmy-like structure