Are you worried?
If you are worried about your data in LastPass or the cloud - then read this article https://www.forbes.com/sites/thomasbrewster/2019/04/10/what-happened-when-the-dea-demanded-passwords-from-lastpass/
It seems 90% of the people in this thread - and the writer of this article - did not do their homework or know anything about how AES-256 bit encryption works... shame that the industry is dominated by people who do not understand the basic principles of encryption and cryptography.
Saying that open source is better is just ridiculous. Most people compile opensource in compilers that have in-built backdoors added to the code they are compiling for crypto mining or other ransomware and adware. 95% of the people do not check their compiler or code and therefore all of you using OpenSource software just because "its better" are way off the real world of security products. Good luck!