That's not a risk, that's just an inefficiency further down the line (migrating data from sqlite to a "real" database can indeed be quite a chore, but far less so if you formalized your schema and constraints beforehand, so that a migration mostly involves exporting to SQL, rewriting where needed, and then importing into whatever dbms you end up using later on in the lifetime of your project).
When we're talking about risks, think security exploits: how is sqlite3 more likely to get your data leaked, or flat out copied in its entirety, compared to using a mysql/postgres/etc.