It comes and goes in waves. The Thomas Bowdler from whom the term "Bowdlerization" is derived published his sex-sanitized Shakespeare editions in 1818.
As to what the odds are that any random copy would be censored, it's hard to say. For a work that's out of copyright, there's no copyright owner who can take legal action to thwart publication of modified versions. However in the US at least, such editions are typically advertised as modified because they are being marketed to schools and such as safe for children. If an edition is explicitly labeled as "unabridged", it's probably fine because otherwise there's the possibility of an ornery anti-censorship advocate pursuing a false advertising consumer protection claim.
https://en.wikipedia.org/wiki/Expurgation
You can definitely find censored versions in the modern marketplace. Here's censored Tom Sawyer:
https://www.amazon.com/Mark-Twains-Adventures-Tom-Sawyer/dp/...
As to what the odds are that any random copy would be censored, it's hard to say. For a work that's out of copyright, there's no copyright owner who can take legal action to thwart publication of modified versions. However in the US at least, such editions are typically advertised as modified because they are being marketed to schools and such as safe for children. If an edition is explicitly labeled as "unabridged", it's probably fine because otherwise there's the possibility of an ornery anti-censorship advocate pursuing a false advertising consumer protection claim.