Probably because of https://basicattentiontoken.org/
For a group that's largely bet their fortunes on internet companies, it's kind of funny that anything crypto is so toxic here, but that's probably the reason.
The actual browser is under good technical stewardship from what I know. It's essentially not-evil Chrome with an optional crypto-for-ads monetization model, a crypto wallet, and some primitive default privacy and adblocking tools.
It suffers from the same technical deficiencies as Chrome (installing addons is harder than it should be, addon API is weak compared to firefox, Google controls the "store" for extensions), but I'd recommend it over any other Chromium-based browser.