The Vero messaging platform uses a vero_id query string parameter to annotate third-party URLs with "the unique ID of the user who has clicked the link."

The purpose for this is described in their documentation:

Adding this parameter enables Vero’s Javascript library to automatically identify a user when they land on your site, even if they are not already identified. This enables cross-device tracking and ensures a more complete and accurate customer profile.

They do offer the option of removing that parameter from URLs and explain its effect:

When disabling appending vero_id to your campaigns, Vero’s Javascript library will no longer automatically identify users when they click through from an email.

Therefore stripping out this parameter should have no webcompat implications.