Yes. Now if you use apt to install Firefox or Thunderbird, it will reinstall snap and install the snap versions of those programs.
If you blacklist snap, it’ll throw an error when you try to install Firefox or Thunderbird cause it can’t resolve their “dependencies”.
You’ll have to install those programs from outside of Ubuntu’s repositories, and the list of affected programs is growing.
Ubuntu’s stated goal is to eventually use snap for all userland apps.

You mean old Ubuntu?

Call Microsoft about a bug and tell me how well their support works for you.

Pretty well, actually.

Sometimes I long back for the times when I just used my computer to do things, instead of forming an opinion about the compression rate of my cursor’s image data.