Listing the outrage du jour is not a good counterargument. The principle of "keep politics where it belongs" is a critical part of your ability to effect political change on issues like yours.

If you abandon it, then it gets much easier to silence unpopular voices -- the cab driver won't take you to the protest march, your ISP shuts down your advocacy domain, facebook bans your support group, all because your politics conflicts with theirs. Total political war is bad for everyone, especially those who are already unpopular.

Cabs are political, see Uber. ISPs are political, see net neutrality and state providing. Facebook is political because it is a corporate entity defined in law.

But do go on...

"X is political because it is a corporate entity defined in law." is a fully general argument that every company ever "is political", which is the dilution into meaningless I mentioned earlier.

And for all the things you mention, I support making them less political rather than more, and so should you. Finding an example of a politicized aspect of a thing is not an argument that it should become more politicized.

Or optionally, a corporation under capitalism is a political entity with political implications?

Your pick, though, it sure seems meaningless...