I'd guess far more established companies go with hosted Microsoft apps than Google's.
Not to mention that beef with bigtech is bipartisan. But antitrust moves like this are not the preferred tool of the right; coercive type stuff like the legislation in FL and TX is
alphabet(google)=msft=apple=starbucks=etc...
One other angle is to regulate them stronguely via interop with technically simple, but able to do a good enough job, and stable in time protocols/software.
For instance, tons of google services can work with a noscript/basic (x)html browsers, games from msft own studios should seriously run on lean elf/linux distros, etc.