Don't be naive. Most contraceptive "failures" aren't really failures. That's why the rise of long term birth control methods has helped dramatically reduce teen pregnancy. Many women are simply "forgetting" to take the pill to passively move the relationship to the next level.
The effectiveness of the implant is over 99% with 'perfect use', and also over 99% with 'typical' use, because there is very little margin for user error
IUD and IUS are more than 99% effective with both perfect and typical use
Whilst the contraceptive pill is over 99% effective with 'perfect use', typical use is approx 91% effective
The injection is over 99% effective with perfect use. Typical use is around 94% because the jab lasts 3 months and people don't always go and get it redone on time
Condoms are 98% effective with perfect use, but typical use is only 82%
Of course there will be stories of implant and coil failures, nothing is 100%. Although the chances of a contraceptive failure with the use of both a LARC and a barrier method are close to zero
If people were genuinely immune to the hormones of the pill ('it didn't work for me') then the effectiveness of the implant would be lower. But it isn't. The difference in effectiveness between the two forms of birth control is primarily because of user error.
(Disclaimer - worked on the government teen pregnancy and sexual health strategy with the department of health for 2.5 years)