He can do as he sees fit. Though I see him as an ungrateful whiner trying to disrespect the couple that raised him (BTW his birth mother was white), the country and institutions that gave him all his opportunities, in order to impress his new BLM muslim girlfriend and gain some publicity as his career falls apart.
And hopefully the public will boycott 49er’s until they get rid of him. If they get on Monday Night Football, don’t watch, find something else to do. Let’s see if he’s willing to stick it out when everyone else does what they see fit to do. Which is make him irrelevant.