Title says it all, basically where do you think devs will gather both for marketing their product as well as just having a personalized developer-orientated feed? Twitter? Mastodon? TikTok? Reddit? Instagram?
They all lack in some aspects...
GitHub? It still is, and has been, the “social media” for devs (as much as I detest that term)
My RSS reader makes an algorithmic feed from 110+ sources. Lately it selects about 300 articles for me to look at a week out of maybe 8000 or so, it will speed up the cadence if I read more.
Personally I think ActivityPub > RSS because you don't have to poll, poll, poll, and poll some more and then poll again as much as you do with RSS, but there are fewer ActivityPub feeds on the ground right now. I might rebuild that system to work around ActivityPub someday.
If Brand Ecchs doesn't want to support RSS or ActivityPub I'll just read something that does.