When connecting SyncWith to Google Ads you'll be required to give SyncWith permission to edit your Google Ads account. This is because this is the only access type that Google Ads provides in this manner.
SyncWith will never ever attempt to edit your Google Ads in any manner whatsoever. SyncWith will simply run the reports you've requested or configured.
Work around
If you'd feel more comfortable, there is a work around:
Setup (or find) another Google account
Invite this new google account to your Google Ads account and give it read only access
Use this new Google account to connect SyncWith to Google Ads
Then, SyncWith will have read-only access.