I don't recall what app I was using before Sync was ready, but it had the option built in. Sync was my favorite Reddit app, and I am so glad it's available for Lemmy. I'll check out blocking through the website. Thanks for the heads up!
There's filtering in app, too, which can help, but if you don't want to see any bots, I feel like that's your best bet. (If it's just one or 2, you can block them from any post without too much hassle either.)