That sound borderline illegal. It's open source, if you sell it for profit you're breaking the license. Its also available for free, downloadable for free and the bootstrapped downloadable for free, all under the same open source license.
This is bullshit. You can sell the blockchain because it is public database and there is no license attached to it. You can also sell most bitcoin wallet software including bitcoin core because they are released under the GPL and the GPL allows you to sell software. That's how redhat became a billion dollar company.
Edit: actually bitcoin core is released under mit license which is even more permissive:
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
https://github.com/bitcoin/bitcoin/blob/master/COPYINGemphasis mine.