Can i create my own b2b Database to sell ?

Build your own b2b database.
Hello I would like to build a very large database for b2b leads with focus on Europe. Does anyone have experience with this? Do you build it with scrappers/crawlers ? I would be very happy to create high quality up-to-date databases.
I have potential clients for such lists but have no idea how to get such amounts of data. Apparently there are many crawlers but I think it takes forever if they have bad performance and 2. they only work with linkedin or google my business or or ...
I would appreciate any tips!

you are looking for b2b info so it makes sense to focus on linkedin data as main input. GMG can also be of help, even social media profiles may help you.

You can already use the databases you have created and own and earn over time. Why sell it?

@Yashas01 We would love to talk with you about partnering up. We have the unique soft, that can acommodate your needs in terms of high quality and vast amounts of data. PM me to discuss.