Hey. It's working fine here (amd64 6.5-current, Chrome 73.0.3683.103).
It might be worth trying to change your user agent. Mine is:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36
If anyone else wants to play around, you're welcome to these credentials for Sketchup Free:
email:
sketchup@mailinator.com
password: Sketchup123$