Absolutely! I remember Basecamp's CEO tweeting about this https://twitter.com/jasonfried/status/1168986962704982016
In the replies Google says: "we don’t restrict trademarked terms as keywords. We do restrict trademarked terms in ad text if the trademark owner files a complaint"
It's a gamble on the strength of your brand to not buy that ad. I think it makes sense that eBay can do away with it, because people typing "eBay" in Google will scroll down for eBay, they won't click on "Company X - Best eBay alternative." Most brands aren't that strong...