They're one of the top, if not the top, cloud providers. It's not surprising to mention AWS here, and GP also mentions Azure...
> one of the top cloud providers, if not the top
rather than:
> one of the top, if not the top, cloud providers
since the latter cashes out to:
> one of the top cloud providers, if not the top cloud providers
(Sorry. I know it’s annoying … but it’s my life’s mission to eradicate this particular construct.)
AWS is probably ~20% above others from sources I know that work on AWS and Azure billing teams.