What. Everyone of them is an anti-virus extension except uBlock Origin:

Avast, Avira, Bitdefender, CheckPoint SandBlast Agent, Malwarebytes, McAfee, Panda, Windows Defender,... All are extensions made to enhance the effectiveness of it's own security suite.

uBlock is just a content-blocker.

Fair enough, uBlock Origin advertises itself as following (from the github page):

uBlock Origin is NOT an "ad blocker": it is a wide-spectrum blocker -- which happens to be able to function as a mere "ad blocker". The default behavior of uBlock Origin when newly installed is to block ads, trackers and malware sites -- through EasyList, EasyPrivacy, Peter Lowe’s ad/tracking/malware servers, various lists of malware sites, and uBlock Origin's own filter lists.

However, I assume that most people still use it mainly for blocking ads. And for that it is excellent.

can those companies provide free access to their blocking lists they created based on their research? ublock will work just as well if so.comparing paid products to freeware is madness in the malwertising space

Judging by these tests Google safe browsing (as Chrome in these tests) is more than enough for malware blocking https://malwaretips.com/threads/updated-24-11-2018-browser-e...