The Debian project is a strong supporter of free software. Since many different licenses are used on software, a set of guidelines, the Debian Free Software Guidelines (DFSG) were developed to come up with a reasonable definition of what constitutes free software. Only software that complies with the DFSG is allowed in the main distribution of Debian.
The thing with buying leads is that they likely come from a list put together of candidates that may or may not have an interest in similar businesses and services. These bought leads are not guarantees, and some of them might have interest in related products, but will not be suitable for your business. So when you work to convert these leads, you will have no such luck. But when you find a lead organically and work to convert them, you know they have found your business and they are actually interested because they sought you out, and not the other way around. This fact alone will bring you more luck in the conversion process.
It is also possible to purchase products in small "trial size" containers. This is common with toiletries such as shampoo, which are useful for vacations or other travel, where large bottles or other containers would be impractical (or more recently, not permitted for air travel). These are also often provided in hotel and motel rooms for the guests. Samples may also be loaned to the customer if they are too valuable to be given for free, such as samples of a countertop or of carpet to be used for remodeling. Sometimes companies in b2b market will offer sample of data or service for free before engaging business relationship.
One of the new class of messaging services with an ecosystems of apps, Telegram delivers not only easy communications, but also encryption security end-to-end. It's a stand-out on iPhone, and has native apps on just about every platform available. Send messages, files, photos, animated GIFs (the search is built in), and create channels of up to 5,000 people to broadcast to.