I don’t eat any canned meats or veggies from anyone else because I don’t know that they’re as exacting about their process as I am. Fruits and pickles have a lot more leeway due to their acid content so I’m fine with eating those.
On canning meats – I would follow the official recipes to the letter. That way, you don’t have to be leery of eating the results.
Yes, people who don’t follow the official recipes may be fine, or they may get botulism – like this guy who canned venison with an old family recipe:
http://www.knkx.org/post/home-canning-hobby-leads-near-fatal-medical-emergency I won’t take that chance, myself. You’ll have to decide for yourself.