My experiences with SubmitHub were terrible, tbh. I think there’s so little money in music blogging at the moment, that because using SubmitHub as a blog is monetised, they are incentivised to process & reject as many submissions as possible.
Anecdotally, including talking to music PR people who included it in their rounds: the “feedback” is often nonsensical (eg, saying “I didn’t like the vocals” on an instrumental track). Or having a track rejected on SubmitHub, but accepted when sent in the traditional way through a PR company.
Sorry to be a Negative Nancy 