As LinkDeal runs with a Chrome extension directly inside of your browser, you don't need to worry about LinkDeal causing issues with your LinkedIn account.
LinkDeal uses the LinkedIn Voyager API in-browser, a method which is popularly accepted as the safe, defacto standard for LinkedIn automation.
There are a lot of LinkedIn automation tools that use proxies which could be detected by LinkedIn, who may put a temporary or permanent ban on your account. LinkDeal does not currently use this type of technology and respects the limits imposed on actions by LinkedIn, such as connection requests, profile views and more.
For example, LinkDeal will not attempt to connect with more than 250 people on LinkedIn per week. This is to ensure there is no activity on your account that could be deemed as "automated" by LinkedIn. If more than 250 people are found in your meetings, LinkDeal will queue them and distribute the connection requests in a balanced manner, for the safety of your account.