ZScaler comes from a vendor and a purchase agreement, uBlock Origin comes from "some guy" for free and that makes corporate folks uneasy. If Firefox would offer uBlock Origin in their enterprise version for $100/seat/month and market it as an "endpoint malware blocker for the cloud" instead of an ad blocker they'd probably get a lot of uptake.
ZScaler comes from a vendor and a purchase agreement, uBlock Origin comes from "some guy" for free and that makes corporate folks uneasy. If Firefox would offer uBlock Origin in their enterprise version for $100/seat/month and market it as an "endpoint malware blocker for the cloud" instead of an ad blocker they'd probably get a lot of uptake.