

…what?
If there were multiple search engines (there are) then SEO would focus on whichever were most popular
I’ve literally done work where SEO included making sure Bing was also optimized for, and I know others who have also done so
More engines would make SEO harder and longer as we assume each engine would search differently, but SEO will creep into any engine that gets popular for the obvious reason of people wanting their content seen
Not understanding what words mean isn’t an unpopular opinion, you’re just wrong
Not about the first bit, that’s arguable
You definitely DO need more labels than straight, gay, and bi. For example: asexual or sapiosexual, those don’t fit into any of the 3 you listed