Facebook had already banned advertising other cryptocurrencies in the run-up to this announcement (well, back in January 2018), so the effort to prevent other cryptocurrencies from scaling is well underway.
That's unfair, there was a lot of pressure on companies to protect users from scammy crypto ads during the big bubble of Bitcoin. I think many companies banned ads for shady sites and to imply they did it only to promote their own coin isn't fair.
I totally agree that it was good move from a user perspective. It's just a happy coincidence. Or perhaps they saw how many outfits (shady or otherwise) were affected by the ban and decided it represented a good market opportunity for them to step in and fill a gap?
