Can I Use GNU Lesser General Public License?
Can GNU license be used commercially?
Software under the GPL may be run for all purposes, including commercial purposes and even as a tool for creating proprietary software, such as when using GPL-licensed compilers.
GNU General Public License - Wikipedia
Can I use LGPL in closed source?
TL;DR A component licensed under LGPL can be used by closed source, proprietary software, both internally used and distributed, for free, with no effects on the software using the component.
The LGPL License - Passion for Coding
The key difference is that the LGPL strips the GPL from most of its “virality”. But the only reason to use the GPL instead of another license is that it forces dependent code to also be licensed under the GPL. It is therefore possible to use LGPL code in a GPL project but not the other way round.
Can I use some GPL code in LGPL project?
Is GNU Lesser General Public License free for commercial use?
The GNU Lesser General Public License (LGPL) is a free-software license published by the Free Software Foundation (FSF)....GNU Lesser General Public License.
GNU Lesser General Public License - Wikipedia