Interestingly I've seen a strong pro-Israel bias, particularly on the larger subreddits (like the default ones). Some of the smaller ones do seem to have a pro-Palestine (or pro-civilian) outlook but nothing that I would describe as "strongly anti-Israel"
The default subreddits are truly awful. r/worldnews is the first one that comes to mind. They were accusing the murdered Reuters journalist of being a member of hamas.
I decided to never look at those subreddits ever again.
Whenever the topic of water in Gaza comes up in /r/worldnews, there's an oft-repeated bit of misinformation that Gaza doesn't have water because they dug up the EU-financed pipes to make rockets.
It's not quite based on nothing: there is footage of Hamas (or maybe Islamic Jihad?) digging up pipes to use for rockets and a Guardian article saying that Hamas could use the EU-financed pipes to make rockets, but as far as I can tell there isn't any evidence that the pipes Hamas are using are from critical in-use infrastructure.
One reddit commenter posted that the video of the pipe being dug up was to supply an abandoned Israeli settlement. Israel shut that water off a long time ago. I can't verify that's correct, but it sounds plausible.
What you say about Reddit is certainly not my experience. /r/UKPolitics for example - anything posted about Istael/Gaza is now moderated out. And comments are dominated by people still parroting the debunked stories about mass rapes and baked babies.
When the crisis was initially unfolding, I followed a few of the major subreddits, and it was entirely pro-Israel. It was kind of shocking how uniformly pro-Israel the comments were.
I think it depends on what subreddit you're on. /r/worldnews tends to be very pro-Israel, unless the comment are on a story about settler violence. /r/politics is more balanced.
Reddit, at least, seems to be (rightfully or not) dominated by a strongly anti-Israel narrative.
Even the "great" BBC is not willing to call a spade a spade.