The claim, by cracking your fingers you start to develop Arthritis, is misleading as it is scientifically false as there are no studies to support this information. Though it might sound alarming, the sound is not the “popping” of bones. An article from Harvard Health and Publishing explains that “The "pop" of a cracked knuckle is caused by bubbles bursting in the synovial fluid — the fluid that helps lubricate joints”.
https://www.health.harvard.edu/pain/does-cracking-knuckles-cause-arthritis
There are two types of arthritis, inflammatory arthritis and degenerative arthritis. Though it is generally proven that there is no correlation between these two types of arthritis and knuckle popping, “The causes for either are not well known and research focuses on elucidating the mechanisms leading to these diseases” according to John Hopkins Arthritis Center. They also point out that while cracking knuckles and arthritis are not scientifically proven to be linked, they do believe that popping knuckles gives an individual more of a chance of injuring ligaments and bones.
https://www.hopkinsarthritis.org/arthritis-news/knuckle-cracking-q-a-from/
It is also believed that cracking knuckles can lower grip strength, causing arthritis, however, a study performed by Robert D Boutin, Anju P Netto, ect. Published in the National Library of medicine shows there is no proof of this, as of 2017. They tested the joints of 40 adults (400 joints) with 30 being “habitual knuckle crackers”. The “physical examination included evaluation for swelling, grip strength, and ROM before and after attempted knuckle cracking”. They found no swelling or grip strength issues, and a greater ROM after testing. They concluded that there is no evidence stating that cracking knuckles lowers grip strength, but stated that there should be more long term studies to watch the effects of knuckle popping.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5339152/
This overarching claim that cracking your fingers leads to arthritis is misleading because there is no long term evidence of this effect.