To block outgoing connections, you can block the following IP address. At the present time, I don’t believe it interferes with any other services, but if you block the following IP, connecting to computers via Google Remote Desktop stops working

$ whois 74.125.247.128
% IANA WHOIS server
% for more information on IANA, visit http://www.iana.org
% This query returned 1 object

refer: whois.arin.net

inetnum: 74.0.0.0 – 74.255.255.255
organisation: ARIN
status: ALLOCATED

whois: whois.arin.net

changed: 2005-06
source: IANA

whois.arin.net

NetRange: 74.125.0.0 – 74.125.255.255
CIDR: 74.125.0.0/16
NetName: GOOGLE
NetHandle: NET-74-125-0-0-1
Parent: NET74 (NET-74-0-0-0-0)
NetType: Direct Allocation
OriginAS:
Organization: Google LLC (GOGL)
RegDate: 2007-03-13
Updated: 2012-02-24
Ref: https://rdap.arin.net/registry/ip/74.125.0.0

OrgName: Google LLC
OrgId: GOGL
Address: 1600 Amphitheatre Parkway
City: Mountain View
StateProv: CA
PostalCode: 94043
Country: US
RegDate: 2000-03-30
Updated: 2019-10-31
Comment: Please note that the recommended way to file abuse complaints are located in the following links.
Comment:
Comment: To report abuse and illegal activity: https://www.google.com/contact/
Comment:
Comment: For legal requests: http://support.google.com/legal
Comment:
Comment: Regards,
Comment: The Google Team
Ref: https://rdap.arin.net/registry/entity/GOGL

OrgAbuseHandle: ABUSE5250-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-650-253-0000
OrgAbuseEmail: network-abuse@google.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE5250-ARIN

OrgTechHandle: ZG39-ARIN
OrgTechName: Google LLC
OrgTechPhone: +1-650-253-0000
OrgTechEmail: arin-contact@google.com
OrgTechRef: https://rdap.arin.net/registry/entity/ZG39-ARIN