My work blocks next to nothing at the browsing level, they are pretty relaxed. They also don't have many limits on what can be installed on local devices.

However, I'm not minded to push it too far and explore the limits.

At my old place, the blocking was quite a lot stricter and I came up against a blocked webpages with a fair bit of frequency (I think they had 'Barracuda' blocking stuff) but no one ever came and spoke to me or (to my knowledge) my boss about it