How do you protect your Google budget from click fraud?

We've had some large Google Ads accounts experiencing spikes in clicks & CTRs with major drops in ROI & Conversions. After installing a website IP tracking software we've concluded click fraud is taking place - perhaps by business competitors? After a tedious manual work of sorting IPs and blocking them on Google's IP Exclusion list - we've found a click fraud protection software that does it automatically. Works like a charm! Conversions are back up, stats all back to normal.
Do you track click IPs / click fraud at all? How would you block click draining your budget?

 

Simple, don't allow clicking.

 

Campaign goals are clicks from customers. This is the main sales channel for our customers

 

Now it becomes really hard. There are some organizations which work on clicking into advertisments from enemy's AC. They use different IPs, so Google definitely can't check it all avoiding any harm to contibutor.