To answer your question - NO - there is no benefit to signing up for Optery if you do not have a presence in the U.S. The only benefit would be that we will notify you in the future when we begin offering our service in your country. This sentence is buried in the post above "Optery is only for U.S. residents for the time being, and this is one main reasons—the problem is at its worst here."
The reasons the service is charged on an ongoing recurring fee are:
1) We are constantly adding new data brokers, so if you keep the service running, you get covered for new data brokers as we add them to your plan.
2) We do ongoing monitoring and scans, to find and remove your profiles if they pop back up. Unfortunately, over time, many data brokers start adding it back. The CCPA (California's Privacy Law) permits a data broker to stop honoring an opt out after 12 months. After opting out, many data brokers actually display a message apologizing in advance admitting that sometimes their opt out records are over-written by accident which might cause your data to reappear.