As protests stemming from the death of George Floyd wrack the nation, a number of leading tech companies have offered their support for demonstrators and funding for social-justice organizations. Twitter Inc. changed its profile bio to read simply “#BlackLivesMatter,” while Alphabet Inc.’s Google said on its main search page: “We stand in support of racial equality, and all those who search for it.” Google’s YouTube said it would donate $1 million “in support of efforts to address social injustice.” Major streaming services — such as Netflix Inc.,, Amazon.com Inc.’s Prime Video, Walt Disney Co.-controlled Hulu and AT&T’s T, HBO Max,...