[stvrsxz]

I am using Joplin for years and I am pretty satisfied with it. (This is not a comparison because I have never used Obsidian)

It is doing 99% of what I ever wanted to do with my knowledge base. Though, if I am in a hurry and I want to quickly write something down (like a quick todo or something), then I am still using google keep, because editing markdown in the Joplin mobile app and waiting for it to sync, it is ok but not as quick as google keep. (I will not be surprised if there is a solution to this and I am doing something wrong)

Sure. There are plenty of alternatives, and being open source has its negative and positive things.

Self host is a good alternative if you want to play some and want to own your data 100% and I have tried to self-host Nextcloud on a Raspberry Pi once, but I gave up after some troubleshooting when I found that Hetzner offers ready-made Nextcloud boxes with https and all. I then synchronize my encrypted notes through Nextcloud pretty easily. I have never tried the Joplin cloud solution that was created after I chose Nextcloud (as an alternative also to Dropbox).